Align and improve Portmapping versions Step 2

Align and improve Portmapping versions Step 2

- optimize some pieces of code, mainly by improving checks orders,
  and sometimes by reversing the logic too.
- gather preliminary checks and use "continue" in loop rather than
  else-if-blocks to ease indentation and optimizations
- use (YANG) enums and switch/case rather than (else-)if-blocks
- add some new protections
- get rid of @SuppressWarnings linelength checks
- points with TODO comments potential code mutualizations or alignments
- introduce checkPartnerPort function in Portmapping 1.2.1

JIRA: TRNSPRTPCE-353
Signed-off-by: guillaume.lambert <guillaume.lambert@orange.com>
Change-Id: I91aadb74668cf7f4eb5689824dd33b92badcbe5f