Add support for percona datastore and packages

Also renamed "possible_mysql_packages" to "datastore_packages"
by request.
Add the debian build stuffs
Merge pull request #47 from cweidenkeller/debian-pkg-change

Add the debian build stuffs
Merge pull request #46 from kevinconway/percona_support

Add support for percona datastore and packages
Added bigger timeout and exception handling for apt calls
Merge pull request #48 from cweidenkeller/redis-apt-timeout

Added bigger timeout and exception handling for apt calls
Fixed bug with prepare call
Merge pull request #49 from cweidenkeller/redis_message_handler_prepare_bug

Fixed bug with prepare call
Redis server prepare bug
Merge pull request #50 from cweidenkeller/redis_message_handler_prepare_bug

Redis server prepare bug
Fixed apt_test to expect correct dpkg string
Sneaky pete fixes
Merge pull request #52 from cweidenkeller/redis_agent_bugs

Sneaky pete fixes
Merge pull request #51 from TimSimpsonR/fix-apt-test

Fixed apt_test to expect correct dpkg string
Redis Updates