[FAB-6160] peer deliver refresh AC upon resource update

When https://gerrit.hyperledger.org/r/#/c/16037/ is going to be merged,
the custom ACL is going to reside in the resource config.

The deliver service in the peer would need a way to re-evaluate clients
when a resource config has occurred.

The current code exposes a method to the support of the deliver service
that returns the sequence of the latest channel config.
The access control logic in the deliver service, caches this sequence,
and before sending out a block - it checks if the config has changed,
and if it did - re-evaluates the policies.

This change set, simply makes this sequence to be the sum
of both resource config sequences, and channel config sequences.

Since both sequences are monotonously increasing, the sum is also
monotonously increasing, and therefore we can present to the deliver
service access control logic the sum as the sequence, without
changing anything else.

Change-Id: Ib3cc04c51f21598027fb8eae68d04b027184f52f
Signed-off-by: yacovm <yacovm@il.ibm.com>

core/peer/peer.go

@@ -146,7 +146,8 @@ func (cs *chainSupport) GetMSPIDs(cid string) []string {
 
 // Sequence passes through to the underlying configtx.Validator
 func (cs *chainSupport) Sequence() uint64 {
-	return cs.ConfigtxValidator().Sequence()
+	sb := cs.bundleSource.StableBundle()
+	return sb.ConfigtxValidator().Sequence() + sb.ChannelConfig().ConfigtxValidator().Sequence()
 }
 func (cs *chainSupport) Reader() blockledger.Reader {
 	return cs.fileLedger