Remove *both* instances of proper_common.hrl
Remove *both* instances of proper_common.hrl

...this is because both copies of the file are GPLv3

[finishes #142257563]

Signed-off-by: Zhou Yu <7f3430145af357a9fd7cb1a2d072f9b26e6234cb@pivotal.io>

pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release