[mongo] extend metric list to collect
[mongo] extend metric list to collect

Additional metrics within the following topics:
* Locks
* Network
* Operation
* Replication

Wattpad/dd-agent,Wattpad/dd-agent,c960657/dd-agent,jyogi/purvar-agent,c960657/dd-agent,tebriel/dd-agent,tebriel/dd-agent,manolama/dd-agent,takus/dd-agent,mderomph-coolblue/dd-agent,huhongbo/dd-agent,gphat/dd-agent,gphat/dd-agent,c960657/dd-agent,cberry777/dd-agent,urosgruber/dd-agent,gphat/dd-agent,takus/dd-agent,jyogi/purvar-agent,indeedops/dd-agent,lookout/dd-agent,cberry777/dd-agent,brettlangdon/dd-agent,indeedops/dd-agent,takus/dd-agent,mderomph-coolblue/dd-agent,huhongbo/dd-agent,lookout/dd-agent,brettlangdon/dd-agent,Wattpad/dd-agent,manolama/dd-agent,lookout/dd-agent,manolama/dd-agent,takus/dd-agent,jyogi/purvar-agent,takus/dd-agent,urosgruber/dd-agent,c960657/dd-agent,gphat/dd-agent,brettlangdon/dd-agent,Mashape/dd-agent,cberry777/dd-agent,Mashape/dd-agent,huhongbo/dd-agent,manolama/dd-agent,indeedops/dd-agent,indeedops/dd-agent,pmav99/praktoras,urosgruber/dd-agent,cberry777/dd-agent,indeedops/dd-agent,tebriel/dd-agent,Mashape/dd-agent,Mashape/dd-agent,huhongbo/dd-agent,cberry777/dd-agent,jyogi/purvar-agent,jyogi/purvar-agent,pmav99/praktoras,c960657/dd-agent,manolama/dd-agent,pmav99/praktoras,Wattpad/dd-agent,mderomph-coolblue/dd-agent,pmav99/praktoras,brettlangdon/dd-agent,lookout/dd-agent,brettlangdon/dd-agent,urosgruber/dd-agent,mderomph-coolblue/dd-agent,gphat/dd-agent,Mashape/dd-agent,Wattpad/dd-agent,pmav99/praktoras,mderomph-coolblue/dd-agent,tebriel/dd-agent,lookout/dd-agent,tebriel/dd-agent,huhongbo/dd-agent,urosgruber/dd-agent