Add sudo_flags configuration option to alter sudo behaviour

Default to -H to set $HOME appropriately.

examples/ansible.cfg

@@ -76,6 +76,9 @@ remote_port=22
 
 sudo_exe=sudo
 
+# the default flags passed to sudo
+# sudo_flags=-H
+
 # how to handle hash defined in several places
 # hash can be merged, or replaced
 # if you use replace, and have multiple hashes named 'x', the last defined