[VOL-5222] - Upgrade golang version for VOLTHA jobs

.gitreview
VERSION
----------
  o post-release tasks.  Repository tagged and banched.
  o Add missing newlines at EOF.
  o go.mod syntax does not allow *-dev suffix so update
    master VERSION from v5.5.0-dev to v5.5.0.  Community
    can introduce a dev version when needed.

go/*.pb.og
vendor/*.go
-----------
  o invoke make mod-update to regenerate go.sum and friends.
  o lint clenaups: find . -name '*.go' -print | xargs -n1 gofmt -s -e -w

Change-Id: I3da80c0ce5600679b388e309bfa4702f1ec3212b
diff --git a/vendor/google.golang.org/grpc/clientconn.go b/vendor/google.golang.org/grpc/clientconn.go
index 28f09dc..0374920 100644
--- a/vendor/google.golang.org/grpc/clientconn.go
+++ b/vendor/google.golang.org/grpc/clientconn.go
@@ -500,7 +500,7 @@
 // WaitForStateChange waits until the connectivity.State of ClientConn changes from sourceState or
 // ctx expires. A true value is returned in former case and false in latter.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -519,7 +519,7 @@
 
 // GetState returns the connectivity.State of ClientConn.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a later
 // release.
@@ -531,7 +531,7 @@
 // the channel is idle.  Does not wait for the connection attempts to begin
 // before returning.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a later
 // release.
@@ -810,7 +810,7 @@
 
 // Target returns the target string of the ClientConn.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -865,9 +865,9 @@
 //
 // If ac is Ready, it checks whether current connected address of ac is in the
 // new addrs list.
-//  - If true, it updates ac.addrs and returns true. The ac will keep using
-//    the existing connection.
-//  - If false, it does nothing and returns false.
+//   - If true, it updates ac.addrs and returns true. The ac will keep using
+//     the existing connection.
+//   - If false, it does nothing and returns false.
 func (ac *addrConn) tryUpdateAddrs(addrs []resolver.Address) bool {
 	ac.mu.Lock()
 	defer ac.mu.Unlock()
@@ -1041,7 +1041,7 @@
 // However, if a previously unavailable network becomes available, this may be
 // used to trigger an immediate reconnect.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
 // later release.