Fixing Naming/PredicateName issues

This commit drops the `has_` prefix from several `?` style methods
because that's against the ruby style guide and redundant for a method
ending in `?`.

lib/vmpooler/pool_manager.rb

@@ -181,13 +181,13 @@ module Vmpooler
           end
         end
 
-        return if has_mismatched_hostname?(vm, pool_name, provider)
+        return if mismatched_hostname?(vm, pool_name, provider)
 
         vm_still_ready?(pool_name, vm, provider)
       end
     end
 
-    def has_mismatched_hostname?(vm, pool_name, provider)
+    def mismatched_hostname?(vm, pool_name, provider)
       pool_config = $config[:pools][$config[:pool_index][pool_name]]
       check_hostname = pool_config['check_hostname_for_mismatch']
       check_hostname = $config[:config]['check_ready_vm_hostname_for_mismatch'] if check_hostname.nil?

lib/vmpooler/providers.rb

@@ -87,7 +87,7 @@ module Vmpooler
     # Returns an Array of Pathname objects.
     def gem_directories
       dirs = []
-      if has_rubygems?
+      if rubygems?
         dirs = gemspecs.map do |spec|
           lib_path = File.expand_path(File.join(spec.full_gem_path, provider_path))
           lib_path if File.exist? lib_path
@@ -99,7 +99,7 @@ module Vmpooler
     # Internal: Check if RubyGems is loaded and available.
     #
     # Returns true if RubyGems is available, false if not.
-    def has_rubygems?
+    def rubygems?
       defined? ::Gem
     end