Reduce log level for MongoDB

adding setParameter=logLevel=1 (or 2 for debug) will reduce
the level that MongoDB puts into logs. The default level is
too high and should be lowered.
Removed verbose logging option because it conflicts with this
parameter.
Forked commit b59a9cb11ddbc2260785a58440465fd8b30d7a11 from github.com/puppetlabs/puppetlabs-mongodb repository.

Change-Id: Ibd55af8d2ef57cd12b71c6e7df26526350b4870b
Closes-Bug: #1393400
Merge "Reduce log level for MongoDB" into stable/5.1