[Dummy bug per pkis request so each change in RHEL7.x has a bug]
Description of problem:
RFE: Do a minor spec file cleanup and sync with recent Fedora 22/23 changes. This was mainly done because Fedora 22+23 and RHEL7.2 all were rebased to krb5 1.13.2 so common obsolete constructs were first applied to Fedora and then to RHEL7.2 as part of the rebase
Misc changes include:
- Removal/replacement of obsolete or dangerous shell constructs (e.g. `foo`-->$(foo), rm -R -- "$var" instead of rm -Rf $var, use of correct POSIX shell arithmetric, e.g. [ "$1" -ge 1 ] should be (( $1 >= 1 )) etc etc.)
- use of pax(1) because tar(1) was sometimes producing different md5 hashes for the same directory content (no clue why and the use of pax(1) is harmless because GNU tar(1) can handle POSIX pax/ustar archive formats, too). In the long run we will just stop producing the temporary PDF archive and just rebuild the docs each time during build
- use of printf(1) instead of echo(1) (echo is depreciated by POSIX since years)
- use of shell arithmetic instead of expr(1) (expr(1) in this case is an overkill) 
- removal of obsolete sections