LU-1095: debug: Clarify a IR message about support.

LU-1095: debug: Clarify a IR message about support.

During testing of Imperative Recovery we turned off IR but in the
logs we saw a IR:ON message which is confusing since we set it to
disable on the MGS. The IR:ON message is only to make aware that
IR functionality exist. A better message would be IR: [DIS|EN]ABLED.

Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I5990b26b326ce912faf6c5d556cb92334748322c
Reviewed-on: http://review.whamcloud.com/2853
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@whamcloud.com>