Remove test references to xenserver

tests/compute/helper.rb

@@ -108,9 +108,6 @@ def compute_providers
       },
       :mocked => true
     },
-    :serverlove => {
-      :mocked => false
-    },
     :xenserver => {
       :mocked => false
     }

tests/helper.rb

@@ -15,7 +15,6 @@ if Fog.mocking?
   Fog::Logger.warning "Setting default fog timeout to #{Fog.timeout} seconds"
 
   # These sets of tests do not behave nicely when running mocked tests
-  Thread.current[:tags] << '-serverlove'
   Thread.current[:tags] << '-xenserver'
   Thread.current[:tags] << '-joyent'
   Thread.current[:tags] << '-dreamhost'