Add and commit a single source IP restriction policy.

		>>> clc.v2.Server("WA1BTDIX01").PublicIPs().public_ips[0]
				.AddSourceRestriction(cidr="132.200.20.1/32").WaitUntilComplete()
		0

def AddSourceRestriction(self,cidr):
		"""Add and commit a single source IP restriction policy.

		>>> clc.v2.Server("WA1BTDIX01").PublicIPs().public_ips[0]
				.AddSourceRestriction(cidr="132.200.20.1/32").WaitUntilComplete()
		0

		"""

		self.source_restrictions.append(SourceRestriction(self,cidr))

		return(self.Update())