Fix remove_warnings

Method lib/puppet/provider/keystone.rb/self.remove_providers does not
support multi line warnings and client results having more than one
column. This patch is fixing it (not sure how module can work with such
bug before anyway).

Change-Id: I19c3ce68ef786a2641d1e2808cb4db9979bdcfed

lib/puppet/provider/keystone.rb

@@ -168,12 +168,16 @@ class Puppet::Provider::Keystone < Puppet::Provider
     # I refactor things to use the the rest API
     def self.remove_warnings(results)
       found_header = false
+      in_warning = false
       results.split("\n").collect do |line|
         unless found_header
-          if line =~ /^\+-+\+-+\+$/
+          if line =~ /^\+[-\+]+\+$/
+            in_warning = false
             found_header = true
             line
-          elsif line =~ /^WARNING/
+          elsif line =~ /^WARNING/ or line =~ /UserWarning/ or in_warning
+            # warnings can be multi line, we have to skip all of them
+            in_warning = true
             nil
           else
             line