Adding certification generation and pass it down to puppet-memcached.
NOTE(moguimar): Squashing one extra fix that was merged after the first
patch made it into master.
Squashes:
- Fix memcached restart on cert renewal
(cherry picked from commit 4586911ef793c6b28871963c0a1485d71dee48c6)
Change-Id: I8eb2b45e8868b99dfe402fee514afa8f8c42f086
(cherry picked from commit b0b7b4069aa90080761edb83c65174b116ba5fbb)