Test cases for LABEL with env substitution
Test cases for LABEL with env substitution

Some of these currently fail due to the way environment variable
substitution is performed. Fix to follow.

Signed-off-by: Tim Waugh <fe049355006bf7fdd11c5e47ffe7a5032af30704@redhat.com>

jpopelka/dockerfile-parse,jpopelka/dockerfile-parse,DBuildService/dockerfile-parse,DBuildService/dockerfile-parse