Fix mongodb enterprise 2.4 init script to allow multiple processes per host

The current 2.4 versions of the init scripts do not correctly scrape the pidfile path from mongod configuration :

PIDFILE=`awk -F= '/^dbpath\s=\s/{print $2}' "$CONFIGFILE"`

It should look like :

PIDFILE=`awk -F= '/^dbpath\s*=\s*/{print $2}' "$CONFIGFILE"`