Fix redundant path issue in src.rpm logic.

When the Makefile itself was running the gen
script for src.rpms it was adding
"too much" path.

This adds just the right amount of path.
Bump pungi version

Anaconda has dropped anaconda-runtime scripts and moved to Lorax in rhel7.
Pungi 2.0.22 still uses anaconda-runtime buildinstall, so we need to bump the
package to one that supports Lorax.

- Use the default pungi binary (/usr/bin/pungi) and drop the patches in our
tree.
- Fix a bug in Lorax's treebuilder and apply the patch before running
pungi. This is a temporary workaround until we can add Lorax as
a srcrpm and patch it there.
Some rhel6->rhel7 sed