Bump pungi version and patch Lorax

Anaconda has dropped anaconda-runtime scripts and moved to Lorax in rhel7.
Pungi 2.0.22 still uses anaconda-runtime's buildinstall script, so we need
to bump the package to one that supports Lorax (2.13-2.el7).

- Use the default pungi binary (/usr/bin/pungi) and drop the patches in support/.
- Fix a bug in Lorax's treebuilder and (safely) 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
Replace rpmquery with rpm -q

This fixes gen-makefile-from-src-rpm script on RHEL7.
It appears there are some bugs in rpmquery, and rpm -q is the
preferred route.