bts: Introduce new module for performance tests

A new module is created since its tests are aimed at running against
real HW set ups to check performance of the system under high loads.
As a result, tests in here will usually require a specific config file.

One first test is introduced to activate all TCH/H channels and see if
the BTS (+BTS-TRX) can keep on going fine for a while.

Related: OS#4365
Change-Id: I2d5f0043bdee1f8f5edcf46acce79ce547d1333d
diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index 7fa1af6..46c9647 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -66,6 +66,7 @@
 friend module BTS_Tests_SMSCB;
 friend module BTS_Tests_virtphy;
 friend module BTS_Tests_LAPDm;
+friend module BTS_Tests_perf;
 
 /* The tests assume a BTS with the following timeslot configuration:
  * TS0 : Combined CCCH + SDCCH/4