Test binaries added to middleware list

Test binaries added to middleware list

[Issue#] N/A
[Feature/Bug] N/A
[Problem] security-server tests binaries are not present in allowed middleware
list. Because of that tests fail on rsa image.
[Cause] N/A
[Solution] Test binaries are added in postinstall

[Verification] Build and install test package on rsa image. Check
/usr/share/security-server/mw-list. Test binaries should be added to the list.
Install package again. There should be no duplicates. Run tests for
client-smack, label and server. Results should be identical to those from slp
image.

Change-Id: Idc66e54ffbe3a430ceff6602856863c1e27148eb