ENV/LABEL is not parsed properly about dockerfile-parse

[TomasTomecek]

Wow, I didn't know it's meant to work like that :o

[lkolacek]

@lcarva I tested this in https://brewweb.stage.engineering.redhat.com/brew/taskinfo?taskID=20216421
and worked fine for me. See labels in: http://pastebin.test.redhat.com/577659

[lcarva]

Relevant snippet from @lkolacek's pastebin:

"Labels": {
  "m": "'d' e 'f g'",
  "n": "a b 'c'",
  "o": "$x $y"
}
...
"Env": [
  "x=a b 'c'",
  "y='d' e 'f g'"
]