Prevent *.pyo and *.pyc multilib problems

Differences in the python byte code fails in a build validation
(rpmdiff) done on difference architecture of the same package.

This patch:
 1) Ensures that timestamps of generated *.pyo and *.pyc files match
 2) Python integer literals greater or equal 2^32 and lower than 2^64
    are converted to long right away to prevent different type of
    the integer on architectures with different size of int

https://fedorahosted.org/freeipa/ticket/3858
Remove rpmlint warnings in spec file

Specifically:
- combination of spaces and tabs in one line
- using macros in comments
- using "egrep" instead of "grep -E"

https://fedorahosted.org/freeipa/ticket/3855
Fix selected minor issues in the spec file and license

This patch fixes:
- too long description for server-trust-ad subpackage
- adds (noreplace) flag %{_sysconfdir}/tmpfiles.d/ipa.conf to avoid
  overwriting potential user changes
- changes permissions on default_encoding_utf8.so to prevent it
  pollute python subpackage Provides.
- wrong address in GPL v2 license preamble in 2 distributed files

https://fedorahosted.org/freeipa/ticket/3855
Allow freeipa-tests to work with older paramiko versions

The integration testing framework used Paramiko SFTP files as
context managers. This feature is only available in Paramiko 1.10+.
Use an explicit context manager so that we don't rely on the feature.