In Python3 the pretty table output is a binary type (encoded)
so print function output looks like
b'+-----+-----+\n| foo | bar |\n+-----+-----++\n
instead of
+-----+-----+
| foo | bar |
+-----+-----+
This commit adds a PY3 check and decodes the output before printing.
This brings Murano client in line with other clients which have this
fix already (e.g. Nova, Heat, Cinder, etc)
Change-Id: I102c28828a3ec96266600dd82dcddd8bcf42318d
9142eebe03