Bug 1600893

+++ This bug was initially created as a clone of Bug #1328882 +++

Demonstration why this is strongly desired:

$ LOCAL_PYLIB=~/.local/lib/python$(rpm -E '%{python_version}')
$ mkdir -p "${LOCAL_PYLIB}/site-packages"
$ touch "${LOCAL_PYLIB}/site-packages/commands.py"
$ > "${LOCAL_PYLIB}/site-packages/commands_override.pth" cat <EOF
import sys; sys.__plen = len(sys.path)
.
import sys; new=sys.path[sys.__plen:]; del sys.path[sys.__plen:]; p=getattr(sys,'__egginsert',0); sys.path[p:p]=new; sys.__egginsert = p+len(new)
EOF
$ pcs help
> Traceback (most recent call last):
>   File "/usr/sbin/pcs", line 13, in <module>
>     import cluster
>   File "/usr/lib/python2.6/site-packages/pcs/cluster.py", line 21, in <module>
>     from subprocess import getstatusoutput
> ImportError: cannot import name getstatusoutput

This can be prevented with "-s" option to Python interpreter.

Something similar can be achieved with PYTHONPATH et al. environment
variable manipulation.

This can be prevented with "-E" option to Python interpreter.


Modified bits, regardless if on filesystem or in runtime (this case) are
not supportable in principle, whether the modification is noticable or
completely hidden (this case) --> make "pcs" run Python with "-Es" flags.