Example:
DefaultEnvironment="VAR1=word1 word2" VAR2=word3 "VAR3=word 5 6"
Sets three variables "VAR1", "VAR2", "VAR3".
Double quote is not escaped, as there is no chance it appears in a proxy value. User can still espace it if really necessary
Signed-off-by: Philippe Martin <phmartin@redhat.com>