In PY3, print should used as a function instead of a statement.
This is PY27 compatible as well.
For example, instances of the first case were replaced by the
second case:
>>> print 'help'
File "<stdin>", line 1
print 'help'
^
SyntaxError: Missing parentheses in call to 'print'
>>> print('help')
help
Partially implements: blueprint trove-python3
Change-Id: I21de65bc874d0fcfb51714857f8eaa97acb2f51d
Closes-bug: #1594741