The issue about `config.txt` files is that they contains paths:
* to configuration files, which are in the source tree
* to the dynamic plugins, which are in the build tree
Solution:
* copy all configuration files into the build tree
* all those paths are about the build tree
* tests run from the build tree, no from the source tree anymore
Don't use the same id for the same protocol identified via L3 info or
via standard TCP/UDP detection (example: ospf ip_proto 0x59 or TCP port
2604)
Before:
```
ivan@ivan-Precision-3591:~/svnrepos/nDPI(dev)$ ./example/ndpiReader -H | grep -wE 'OSPF|IPSec|AH|ESP|IP_OSPF'
79 79 IPSec UDP X Safe VPN 500,4500 500
85 85 OSPF X Acceptable Network - 2604
```
After:
```
ivan@ivan-Precision-3591:~/svnrepos/nDPI(ospf-ipsec)$ ./example/ndpiReader -H | grep -wE 'OSPF|IPSec|AH|ESP|IP_OSPF'
79 79 IPSec UDP X Safe VPN 500,4500 500
85 85 IP_OSPF X Acceptable Network - -
116 116 AH X Safe VPN - -
117 117 ESP X Safe VPN - -
184 184 OSPF TCP X Safe Network - 2604
```
Extend internal unit tests to handle multiple configurations.
As some examples, add tests about:
* disabling some protocols
* disabling Ookla aggressiveness
Every configurations data is stored in a dedicated directory under
`tests\cfgs`
