requirements: Remove os-xenapi

We no longer have a Xen driver. This is an unnecessary dependency.

Change-Id: Ic298fa9ac4a8935ce4e0dc17d8842d399d4eb808
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

lower-constraints.txt

@@ -65,7 +65,6 @@ os-service-types==1.7.0
 os-traits==2.5.0
 os-vif==1.15.2
 os-win==5.4.0
-os-xenapi==0.3.4
 osc-lib==1.10.0
 oslo.cache==1.26.0
 oslo.concurrency==4.4.0

requirements.txt

@@ -55,7 +55,6 @@ os-vif>=1.15.2 # Apache-2.0
 os-win>=5.4.0 # Apache-2.0
 castellan>=0.16.0 # Apache-2.0
 microversion-parse>=0.2.1 # Apache-2.0
-os-xenapi>=0.3.4 # Apache-2.0
 tooz>=1.58.0 # Apache-2.0
 cursive>=0.2.1 # Apache-2.0
 pypowervm>=1.1.15 # Apache-2.0