puppet: add disable_puppet function into puppet_page

add disable_puppet function in puppet_page.py to stop puppet service and
remove related configuration info from "/etc/puppet/puppet.conf"

Change-Id: I942252e228e9475c4c41e893aae6507b9505e245
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1023378
Signed-off-by: hadong <hadong0720@gmail.com>