[FAB-11996] Enable creation of raft based channels

This commit enables creation of Raft based channel and aligns unit-tests
accordingly.

Change-Id: Iead5cddcab5137b0bce9740f47db8a3f583f2f4f
Signed-off-by: Artem Barger <bartem@il.ibm.com>

orderer/consensus/etcdraft/chain.go

@@ -150,7 +150,7 @@ func (c *Chain) checkConfigUpdateValidity(ctx *common.Envelope) error {
 
  switch chdr.Type {
  case int32(common.HeaderType_ORDERER_TRANSACTION):
- return errors.Errorf("channel creation requests not supported yet")
+ return nil
  case int32(common.HeaderType_CONFIG):
  configEnv, err := configtx.UnmarshalConfigEnvelope(payload.Data)
  if err != nil {

orderer/consensus/etcdraft/chain_test.go

@@ -474,9 +474,9 @@ var _ = Describe("Chain", func() {
  configSeq = 0
  }) // BeforeEach block
 
- It("should throw an error", func() {
+ It("should be able to create a channel", func() {
  err := chain.Configure(configEnv, configSeq)
- Expect(err).To(MatchError("channel creation requests not supported yet"))
+ Expect(err).NotTo(HaveOccurred())
  })
  })
  }) // Context block for type A config