Handle '#' in var strings by splitting on ' #'

If someone has a " #" in a quoted var string, it
will interpret that as a comment and refuse to
load the inventory file due to an unbalanced
quote. Noisy failure > unexpected behavior.

test/TestInventory.py

@@ -302,4 +302,4 @@ class TestInventory(unittest.TestCase):
         assert vars == {'inventory_hostname': 'zeus',
                         'inventory_hostname_short': 'zeus',
                         'group_names': ['greek', 'major-god', 'ungrouped'],
-                        'var_a': '1'}
+                        'var_a': '1#2'}