mon: transition from MonCaps -> MonCap

Convert all monitor users to use the new MonCap class.

Simplify the semantics around auids by essentially dropping any meaningful
permissions enforcement around them.

Signed-off-by: Sage Weil <sage@inktank.com>
mon: wire new command map to new caps

We can drop the fullcmd nonsense entirely, yay!

Signed-off-by: Sage Weil <sage@inktank.com>
mon: weaken security check on 'log' command

The exec bit doesn't mean anything for the log; make it W.

Signed-off-by: Sage Weil <sage@inktank.com>
vstart.sh: use new mon cap profiles

Signed-off-by: Sage Weil <sage@inktank.com>