Use RWMutex and smaller lock scope for proxy
Use RWMutex and smaller lock scope for proxy

Change-Id: Ic71da51b6469ae94d8a18c266c6de6944300c6d9

ryan-talley/cf-bigip-ctlr,dramich/cf-bigip-ctlr,ryan-talley/cf-bigip-ctlr,ryan-talley/cf-bigip-ctlr,dramich/cf-bigip-ctlr,dramich/cf-bigip-ctlr,dramich/cf-bigip-ctlr,ryan-talley/cf-bigip-ctlr