update irmc document
update irmc document

Update the documentation of IRMC according to the changes of python-scciclient v0.10.0

Signed-off-by: Zhou Hao <f577ade201aa03d612c19915a089dc6084d45cd9@fujitsu.com>
Change-Id: Ic4c359a1b489fb1e6f37759013b66f7eadaf0765

openstack/ironic,openstack/ironic