Use more expressive APIs for shorter code

lib/beaker/host.rb

@@ -489,11 +489,7 @@ def do_rsync_to from_path, to_path, opts = {}
       # We enable achieve mode and compression
       rsync_args << "-az"
 
-      user = if not self['user']
-               "root"
-             else
-               self['user']
-             end
+      user = self['user'] || 'root'
       hostname_with_user = "#{user}@#{reachable_name}"
 
       Rsync.host = hostname_with_user

lib/beaker/platform.rb

@@ -117,9 +117,7 @@ def to_array
     # @example Platform.new('debian-7-xxx').with_version_codename == 'debian-wheezy-xxx'
     # @return [String] the platform string with the platform version represented as a codename
     def with_version_codename
-      version_array = [@variant, @version, @arch]
-      version_array = [@variant, @codename, @arch] if @codename
-      return version_array.join('-')
+      [@variant, @codename || @version, @arch].join('-')
     end
 
     # Returns the platform string with the platform version as a number.  If no conversion is necessary