in policy list module, push boolean not being parsed from yaml correctly

[craigers521]

In order to actually push policy changes to vsmarts, the vmanage_policy_list module requires a push parameter to be passed with a True value.

Typically in yaml this is pretty loose and will allow numerous values that get parsed as True (like yes, Yes, YES, Y, y, on, true, TRUE, True). In order for the updates to get pushed i have to set push exactly to True. Recommend using something like pyYAML to convert boolean value or at the very least get this documented.