Fix InfluxDB incorrect timestamp while performing queries

scripts/lua/modules/timeseries/tests/influxdb2series.lua

@@ -522,7 +522,7 @@ end
 -- ##############################################
 
 function run(tester)
-  if influxdb.db == nil then
+  if influx2Series == nil then
     print("Skipping influx2Series tests. Enable InfluxDB export in order to test.<br/>")
     return(true)
   end

scripts/lua/modules/timeseries/tests/influxdb_queries.lua

@@ -59,7 +59,7 @@ end
 -- ##############################################
 
 -- When performing the derivative between two points, the delta must be calculated
--- and accounted for the first point time
+-- and accounted for the second point time
 function test_simple_derivative(test)
   local test_data = {
     {{v=1000}, now},
@@ -78,7 +78,7 @@ function test_simple_derivative(test)
 
   local rv = test_utils.timestampAsKey(test_utils.makeTimeStamp(res.series, res.start, schema.options.step))[1]
 
-  local t1 = test_data[1][2]
+  local t1 = test_data[2][2]
 
   if not(rv[t1] == 1000) then
     return test:assertion_failed("rv[t1=".. t1 .."] == 1000")

scripts/lua/modules/timeseries/tests/rrd_paths_test.lua

@@ -16,6 +16,7 @@ local replacement_tag = "some_other_tag"
 local prefixes_to_skip = {
   test = true,
   mac = true,                 -- Collides with host, but a MAC address is different from an IP address
+  influxdb = true,
 }
 
 local suffixes_to_skip = {