Use proper function in yum.py
Use proper function in yum.py

The `_find_template_and_rpm_name` function is used
instead of non-existing `_get_template_and_rpm_name` one.

Change-Id: I6f8f4f97e825bc8b8693862d11a0761d4fd6274c

mc2014/anvil,stackforge/anvil,stackforge/anvil,mc2014/anvil