SERVER-15557 extracted mmapv1 startup options from StorageGlobalParams into MMAPV1Options
SERVER-15557 added support for deprecated dotted names to yaml configuration file options
SERVER-15557 added "Storage options" section in --help output.
             migraged dotted names of mmapv1 options from "storage" to "storage.mmapv1"
                 storage.mmapv1.directoryPerDB
                 storage.mmapv1.journal.commitIntervalMs
                 storage.mmapv1.journal.debugFlags
                 storage.mmapv1.nsSize
                 storage.mmapv1.preallocDataFiles
                 storage.mmapv1.quota.enforced
                 storage.mmapv1.quota.maxFilesPerDB
                 storage.mmapv1.smallFiles
                 storage.mmapv1.syncPeriodSecs
             dotted names (without the ".mmapv1" component) of mmapv1 options before migration
                 will still be accepted but a warning will be raised at startup.
SERVER-15557 disallow setting of configuration options for non-active storage engine