If the environment has arch attribute, the environment should be removed
from the file on all other arches. This mirrors similar behaviour for
groups and packages.
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
Instead of hardcoding /usr/bin/python in shebangs, use /usr/bin/env.
This allows Pungi to work with dependencies installed in virtualenv.
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
