Clean scriplet 'post' section.

Clean scriplet 'post' section.

[Issue#]       SSDWSSP-531
[Feature]      Removes unneeded file operations from 'post section'.
[Cause]        Post section is intended for file operations.
[Solution]     Unneeded operations are removed, other are moved to 'install'
               and 'files' sections. Details are placed in CAM project.
[Verification] Two ways:
               - build packages, install them on target and run tests,
               - build image with previously built packages and run tests

Change-Id: I51ccc3dbb8a9b45c3b2da224470b60e2cc830d58

Conflicts:

	packaging/libprivilege-control.spec