Print out a warning when spaces are used in the variable name in Set and MSet....

Print out a warning when spaces are used in the variable name in Set and MSet. It is extremely hard to debug this issue so this should make it easier.
(closes issue #11759)
Reported by: caio1982
Patches:
      setvar_space_warning1.diff uploaded by caio1982 (license 22)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@98714 65c4cc65-6c06-0410-ace0-fbb531ad65f3