bulk -s: Make the output consistent with -C

Reported by:	marino
Fix extra space
Remove the : from -s/-c to be consistent with -C

Reported by:	marino
Remove stale argument from check_leftovers removed in 75467995c
Remove debug code
Pass parameters to rexec properly
Fix interactive jails with jexecd/rexec where TTY is needed.
Fix leftover detection with jexecd (probably pointless anyway)
poudriered: Handle case where /dev/null is missing

CID:	1181995
poudriered: Handle case where O_NONBLOCK cannot be set.

We probably should not exit in this context at all.

CID:	1181916
Use an elseif
Avoid deferencing NULL with execvp(3)

CID:	1241973
Remove dead code
More standardization for colorization - Finished messages
Merge branch 'master' into dragonfly

Conflicts:
	src/share/poudriere/common.sh