The various `install` args should always be passed to salt-bootstrap.

Even when preforming config only, the install flags (i.e. -M, -S, -N),
are used by the bootstrap to determine which configs to copy.

This should help with #3542 and should supersede #3548.
Fixed missing end to if
Merge pull request #3557 from shadowfax-chc/correct-bootstrap-args

provisioner/salt: correct bootstrap args