Refactoring csr.service and csr-OOO.socket

Refactoring csr.service and csr-OOO.socket

 - Using "Wants=csr.service" in csr-OOO.socket is replaced by putting csr.service in multi-user.target.wants.
 - Using "After=csr.service" in csr-OOO.socket is not requires because there is an explicit dependency between socket and service.
 - All four sockets are required for csr.service. So, "Requires=OOO.socket" must be in csr.service.
 - "Sockets=" in the csr.service is replaced by "Requires=OOO.socket". ("Sockets=" includes "After=" and "Wants=")

Change-Id: If6303fcf17f16c70b4c5b67cca897f0c650b4b85