cobbler/pxegen.py: split long lines
make qa (pep8) fixes for cobbler/pxegen.py

cobbler/pxegen.py:74:25: E128 continuation line under-indented for visual indent
cobbler/pxegen.py:76:25: E128 continuation line under-indented for visual indent
cobbler/pxegen.py:79:25: E128 continuation line under-indented for visual indent
cobbler/pxegen.py:81:25: E128 continuation line under-indented for visual indent
cobbler/pxegen.py:85:21: E128 continuation line under-indented for visual indent
cobbler/pxegen.py:87:21: E128 continuation line under-indented for visual indent
cobbler/pxegen.py:91:17: E128 continuation line under-indented for visual indent
cobbler/pxegen.py:95:17: E128 continuation line under-indented for visual indent
cobbler/pxegen.py:99:17: E128 continuation line under-indented for visual indent
cobbler/pxegen.py:103:21: E128 continuation line under-indented for visual indent
cobbler/pxegen.py:106:21: E128 continuation line under-indented for visual indent
cobbler/pxegen.py:110:17: E128 continuation line under-indented for visual indent
cobbler/pxegen.py:114:17: E128 continuation line under-indented for visual indent