Login pattern was too restrictive for example for those using LDAP.
So even if there are limitations in the characters of ntopng usernames,
one can still use external login systems and be able to login with usernames
containing special characters.
Fixes#1884
Prevents
25/Jul/2018 13:18:19 [LuaEngine.cpp:4325] ERROR: Error 'opening '/var/tmp/ntopng/0/rrd/SSL.rrd': No such file or directory' while calling rrd_fetch_r(/var/tmp/ntopng/0/rrd/SSL.rrd, AVERAGE): is the RRD corrupted perhaps?
25/Jul/2018 13:18:19 [dashboard.lua:78] [rrd.lua:327] RRD driver does not support listSeries on multiple tags
25/Jul/2018 13:18:19 [LuaEngine.cpp:4325] ERROR: Error 'opening '/var/tmp/ntopng/0/rrd/HTTP.rrd': No such file or directory' while calling rrd_fetch_r(/var/tmp/ntopng/0/rrd/HTTP.rrd, AVERAGE): is the RRD corrupted perhaps?
25/Jul/2018 13:18:19 [dashboard.lua:78] [rrd.lua:327] RRD driver does not support listSeries on multiple tags
25/Jul/2018 13:18:19 [LuaEngine.cpp:4325] ERROR: Error 'opening '/var/tmp/ntopng/0/rrd/SSH.rrd': No such file or directory' while calling rrd_fetch_r(/var/tmp/ntopng/0/rrd/SSH.rrd, AVERAGE): is the RRD corrupted perhaps?
25/Jul/2018 13:18:19 [dashboard.lua:78] [rrd.lua:327] RRD driver does not support listSeries on multiple tags
25/Jul/2018 13:18:19 [LuaEngine.cpp:4325] ERROR: Error 'opening '/var/tmp/ntopng/0/rrd/Unknown.rrd': No such file or directory' while calling rrd_fetch_r(/var/tmp/ntopng/0/rrd/Unknown.rrd, AVERAGE): is the RRD corrupted perhaps?
25/Jul/2018 13:18:19 [dashboard.lua:78] [rrd.lua:327] RRD driver does not support listSeries on multiple tags
25/Jul/2018 13:18:19 [LuaEngine.cpp:4325] ERROR: Error 'opening '/var/tmp/ntopng/0/rrd/sFlow.rrd': No such file or directory' while calling rrd_fetch_r(/var/tmp/ntopng/0/rrd/sFlow.rrd, AVERAGE): is the RRD corrupted perhaps?
25/Jul/2018 13:18:19 [dashboard.lua:78] [rrd.lua:327] RRD driver does not support listSeries on multiple tags
25/Jul/2018 13:18:19 [LuaEngine.cpp:4325] ERROR: Error 'opening '/var/tmp/ntopng/0/rrd/DNS.rrd': No such file or directory' while calling rrd_fetch_r(/var/tmp/ntopng/0/rrd/DNS.rrd, AVERAGE): is the RRD corrupted perhaps?
25/Jul/2018 13:18:19 [dashboard.lua:78] [rrd.lua:327] RRD driver does not support listSeries on multiple tags
25/Jul/2018 13:18:19 [LuaEngine.cpp:4325] ERROR: Error 'opening '/var/tmp/ntopng/0/rrd/ICMP.rrd': No such file or directory' while calling rrd_fetch_r(/var/tmp/ntopng/0/rrd/ICMP.rrd, AVERAGE): is the RRD corrupted perhaps?
25/Jul/2018 13:18:19 [dashboard.lua:78] [rrd.lua:327] RRD driver does not support listSeries on multiple tags
* Integrate modified nvd3 library with zoom and multicharts working support
* Fix count in RRD driver
* Initial chart ajax migration
* Update nvd3 with zoom stack support
* Fix RRD listSeries with directories
* Work in progress graphs
* Compatibility fix
* Initial support for schema based api
* Add missing script
* Fix listSeries for existance check
* Implement topk timseries api
* Implement topk queries and fix labels and formats
* Migrate interface top sender and receivers
* Migrate charts to new API
* Move timeseries list for menu inside respective scripts
* Add support for extended labels
* Fix missing fields while chaning graph resolution
Also Rename drawRRD in drawGraphs
* Fix historical tabs
* Add missing time fence in influx topk
* Add graphs support for custom statistics visualization
* Initial support for graphs statistics footer
* Implement statistics in single graphs for RRD driver
* Move sampling function into the driver and fix graph statistics
* Fix max/min value offset
* Implement influxdb sampling use built-in FILL
* Implement stats and total serie in influxdb driver
* Update nvd3 with multiChart fixes
* Update nvd3 with new multiChart fixes
* RRD driver fixes
* Move metrics type from single metric to schema
* Handle ajax errors and empty data in charts
* Fix flow device interfaces graphs
* Use timeserie label as timeseries dropdown text
* Implement topk aggregation into one data serie
* ts_utils module now provides all the schemas
* Migrate ntop.exist(rrd) to ts_utils.exist
* Fix timeseries dropdown label
* L4 protos fixes for charts
* Migrate getProtoVolume to new API
* Integrate nvd3 fix for tooltip position
* Initial community graphs migration to timseries API
* Fix community timeseries dropdown and historical tabs
* Hide total serie by default
* Remove l4 protos from topk charts
Migrates class Geolocation to the new libmaxminddb
Handles static/dynamic compilation of libmaxminddb
Adds missing configure/make files for libmaxminddb
Adds libmaxminddb to travis.yml
Adds dev libmaxminddb to .travis.yml
Removes t Makefile
Removes missing ubuntu14 libmaxminddb-dev
Run autoreconf on libmaxminddb
Adds autoreconf to libmaxminddb static build
Adds libmaxminddb dependency to packages
Adds new *.mmdb files to debian/ubuntu ntopng-data
Adds new *.mmdb files to centos6/7 ntopng-data
Removes old libgeoip dep in favor of libmaxminddb
Adds back old .dat to debian/ubuntu ntopng-data
Adds back old .dat to centos ntopng-data
Adds autoreconf for travis
Removes libmaxminddb autoreconf from travis
Removes third-party libmaxminddb
Removes static build of libmaxminddb
Removes old libgeoip1 dependencies
Updates readme with libmaxminddb
Adds geolite attribution
