Support for remote database server plus fix for cron that causes chef run failures

Hi,

the first commit was a minor fix to recipes/default.rb to fix a chef run failure caused by DeleteSessionIDs cron it was missing a value from minutes.

the rest is some changes to support a remote mysql server I removed the call from include mysql::server then refractored to use a dba account for database creation.
I think this should really use a databag to that but have just used a attribute at the minute.

also both the otrs version and this cookbook version were increased