VOL-1497 : Add more control to kv/memory access

- Added kv locking mechanism (etcd only)
- (watch) control path access whenever possible
- (watch) use a transaction for updates and merge with memory
- cleaned up vendoring
- misc changes to fix exceptions found along the way

Amendments:

- Copyright header got removed in auto-generated file
- Changed default locking to false for KV list operation
- Updated backend api to allow the passing of locking parameter

Change-Id: Ie1a55d3ca8b9d92ae71a85ce42bb22fcf1419e2c
diff --git a/vendor/golang.org/x/sys/unix/zsysnum_darwin_amd64.go b/vendor/golang.org/x/sys/unix/zsysnum_darwin_amd64.go
index 9e2837e..654dd3d 100644
--- a/vendor/golang.org/x/sys/unix/zsysnum_darwin_amd64.go
+++ b/vendor/golang.org/x/sys/unix/zsysnum_darwin_amd64.go
@@ -1,4 +1,4 @@
-// go run mksysnum.go /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/usr/include/sys/syscall.h
+// go run mksysnum.go /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/sys/syscall.h
 // Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build amd64,darwin
@@ -431,6 +431,8 @@
 	SYS_NTP_ADJTIME                    = 527
 	SYS_NTP_GETTIME                    = 528
 	SYS_OS_FAULT_WITH_PAYLOAD          = 529
-	SYS_MAXSYSCALL                     = 530
+	SYS_KQUEUE_WORKLOOP_CTL            = 530
+	SYS___MACH_BRIDGE_REMOTE_TIME      = 531
+	SYS_MAXSYSCALL                     = 532
 	SYS_INVALID                        = 63
 )