Remove deprecated hp3par_domain option

The hp3par_domain config option was deprecated in the Havana release.
This just removes it from the config reference guide for the Icehouse
release. This patch resolves the documentation change for patch that
removed it from the source code and unit tests, see
https://review.openstack.org/#/c/65114/ for details.

Change-Id: I8187a772974f36c7ebd5f5674c5c9e0bc1c3376b

doc/config-reference/block-storage/drivers/hp-3par-driver.xml

@@ -250,9 +250,6 @@
 # 3PAR Super user password
   hp3par_password=3parpass
 
-# 3PAR domain to use - DEPRECATED
-  hp3par_domain=None
-
 # 3PAR CPG to use for volume creation
   hp3par_cpg=OpenStackCPG_RAID5_NL
 

tools/autogenerate-config-flagmappings/cinder.flagmappings

@@ -99,7 +99,6 @@ hp3par_api_url hp3par
 hp3par_cpg hp3par
 hp3par_cpg_snap hp3par
 hp3par_debug hp3par
-hp3par_domain hp3par
 hp3par_iscsi_ips hp3par
 hp3par_password hp3par
 hp3par_snapshot_expiration hp3par