proxy: cleanup and minor refactoring

This change includes minor refactoring and cleanup of the proxy
package including the following items:

 * Rename source files with misspelling of round robin
 * Remove unnecessary and redundant comments
 * Update comments for clarity
 * Add locking when updating the round-robin index
 * Improve method receiver names
 * Rename the LoadBalance method to NextEndpoint to add clarity

No changes in behaviour have been introduced.

pkg/proxy/loadbalancer.go

@@ -14,19 +14,15 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-// Loadbalancer interface. Implementations use loadbalancer_<strategy> naming.
-
 package proxy
 
 import (
 	"net"
 )
 
-// LoadBalancer represents a load balancer that decides where to route
-// the incoming services for a particular service to.
+// A LoadBalancer distributes incoming requests to service endpoints.
 type LoadBalancer interface {
-	// LoadBalance takes an incoming request and figures out where to route it to.
-	// Determination is based on destination service (for example, 'mysql') as
-	// well as the source making the connection.
-	LoadBalance(service string, srcAddr net.Addr) (string, error)
+	// NextEndpoint returns the endpoint to handle a request for the given
+	// service and source address.
+	NextEndpoint(service string, srcAddr net.Addr) (string, error)
 }