Add tests from develop

Added tests from develop. The test results need to be modified for 2.0.

maxscale-system-test/nsfilter.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+
+import maxpython
+
+test = maxpython.MaxScaleTest("nsfilter")
+
+server_id = []
+
+for conn in test.repl:
+    server_id[conn] = conn.query("SELECT @@server_id")
+
+nomatch = test.maxscale['rwsplit'].query("SELECT @@server_id")
+match = test.maxscale['rwsplit'].query("SELECT \"test\", @@server_id")
+
+print(nomatch)
+print(match)