juju_utils: fix assumptions about 'subordinate-to' #679
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Few places in the code made assumption that for subordinate charms, the 'subordinate-to' list would contain only principal charms. However that is not the case. If a suboridnate charm is related to other subordinate charms, they show up in each other's 'subordinate-to' lists.
This was especially problematic in the 'get_machines_for_application' function which would end up in an infinite loop.