LU-10756 ptlrpc: change IMPORT_SET_* macros into real functions

LU-10756 ptlrpc: change IMPORT_SET_* macros into real functions

Make the IMPORT_SET_STATE_NOLOCK and IMPORT_SET_STATE macros into
normal functions. Since import_set_state_nolock() is basically a
wrapper around __import_set_state() we can merge both functions.

Change-Id: Idaa6aeb81ff2282e2f83d758a267129e686bd794
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/35463
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Ben Evans <bevans@cray.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>