[2.13] Refresh postfix profiles

Refresh the postfix profiles in the 2.13 branch with (mostly) all changes in master.

The most important changes are:

• support having the postfix/* binaries in /usr/lib/postfix/bin/ (like for example openSUSE has now)
• add profile names
• rename the profile files to postfix-*
• several "smaller" changes (especially added permissions), see the individual commits for all details

Note that some changes were not backported to the 2.13 branch:

• adding abi rules
• changing #include to include
• removal of "superfluous" rules covered by abstractions (dd4903ef)
• removal of peer=/usr/lib/postfix/... rules