INTEXT-32 - SMPP - Fix Failing Unit Tests
- add mock smpp server for tests
- enforce source address flip for inbound gateway
- tidy up
INTEXT-32 - Cleanup

* Ensure ASL license headers are present
* Add "@since" with "1.0" to the Java source files
* Cleanup
* The mockSmppServer server port is dynamically chosen
* Centralize the mockSmppServer bean declaration to reduce duplication
Merge pull request #22 from otnateos/INTEXT-32

* otnateos-INTEXT-32:
  INTEXT-32 - Cleanup
  INTEXT-32 - SMPP - Fix Failing Unit Tests - add mock smpp server for tests - enforce source address flip for inbound gateway - tidy up