rename Vm Operation context

Author: kbrock

spec/models/manageiq/providers/vmware/cloud_manager/vm_spec.rb

@@ -1,5 +1,5 @@
 describe ManageIQ::Providers::Vmware::CloudManager::Vm do
-  context "#is_available?" do
+  context "#supports?" do
     let(:ems)                   { FactoryBot.create(:ems_vmware_cloud) }
     let(:vm)                    { FactoryBot.create(:vm_vmware_cloud, :ext_management_system => ems) }
     let(:power_state_on)        { "on" }

spec/models/manageiq/providers/vmware/infra_manager/vm_spec.rb

@@ -7,7 +7,7 @@
   let(:power_state_on)        { "poweredOn" }
   let(:power_state_suspended) { "poweredOff" }
 
-  context "#is_available?" do
+  context "#supports?" do
     context("with :start") do
       let(:state) { :start }
       include_examples "Vm operation is available when not powered on"