Add printf format checks to the rest of tree

Add printf format checks to the rest of tree

Add printf format checks to the remaining va-arg printf-style
functions in the tree. There are no error fixes required from this
change.

Change-Id: If774532a3ac5d8b611ec9f47576e933a57907185
Reviewed-on: http://gerrit.openafs.org/796
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>