pcu: Get rid of PCU_Tests.ttcn tests

Delete PCU_Tests.ttcn along with the configs, since they are broken and
we are only adding new tests to PCU_Tests_RAW.ttcn. They are broken
because it's not possible to run multiple tests after another.

Some components which used to be in PCU_Tests.ttcn and which were used
by other PCU_Tests*.ttcn files have been moved to SGSN_Components.ttcn

Selftests have been moved to PCU_selftest.ttcn.

Small placeholder for module PCU_Tests is left in PCU_Tests.ttcn to
still be able to compile the binary as "PCU_Tests" and avoid changing
that part of docker setup. We'll eventually rename RAW tests soon
anyway.

Change-Id: Ie862a1525e9f4f9a3f2427ac3898810e3d044d2f
diff --git a/pcu/PCU_Tests_RAW_NS.ttcn b/pcu/PCU_Tests_RAW_NS.ttcn
index b1b19bb..81b60c3 100644
--- a/pcu/PCU_Tests_RAW_NS.ttcn
+++ b/pcu/PCU_Tests_RAW_NS.ttcn
@@ -12,8 +12,8 @@
 
 import from General_Types all;
 import from Osmocom_Types all;
-import from PCU_Tests all;
 import from PCU_Tests_RAW all;
+import from SGSN_Components all;
 import from Osmocom_Gb_Types all;
 import from NS_CodecPort all;
 import from NS_Types all;