Fix broken specs from EMS hostname validation

ManageIQ/manageiq#16714 Caused the specs which
use invalid hostnames to fail in different ways then expected.  The test
checking for nil ems hostname is now invalid because that isn't possible
and the other changed the hostname to something with a space which can
be replaced with a '-'

spec/models/manageiq/providers/vmware/infra_manager_spec.rb

@@ -50,11 +50,6 @@
  expect(@ems.remote_console_vmrc_support_known?).to be_truthy
  end
 
- it "false for missing hostname" do
- @ems.update_attributes(:hostname => nil, :api_version => "5.0", :uid_ems => "2E1C1E82-BD83-4E54-9271-630C6DFAD4D1")
- expect(@ems.remote_console_vmrc_support_known?).not_to be_truthy
- end
-
  it "false for blank hostname" do
  @ems.update_attributes(:hostname => "", :api_version => "5.0", :uid_ems => "2E1C1E82-BD83-4E54-9271-630C6DFAD4D1")
  expect(@ems.remote_console_vmrc_support_known?).not_to be_truthy
@@ -135,7 +130,7 @@
  end
 
  it "will restart EventCatcher when hostname changes" do
- @ems.update_attributes(:hostname => "something else")
+ @ems.update_attributes(:hostname => "something-else")
  assert_event_catcher_restart_queued
  end