e2e-tests: Add CheckMasterBranchReplica1 scenarios

Add the CheckMasterBranchReplica1 and GetMasterBranchRevision scenarios.
Make the latter usable independently of the former which composes it.
Adapt the existing SubmitChange scenario so it can be composed by
CheckMasterBranchReplica1 just as well.

CheckMasterBranchReplica1 is meant to test a gerrit (8080) replicating
to another (8081) locally. The scenario assumes an already created and
replicated test project, with a name specified through the already
supported PROJECT property; cf. [1] (e.g., [2]). The core CreateProject
scenario can be used prior, for that purpose. This is all based on the
core replication plugin being installed and configured with at least the
heads and meta refs pushed.

Make this CheckMasterBranchReplica1 scenario use its own http password
towards the 8081 replica, to not fail upon a 401 otherwise. The other
CheckMasterBranchReplica1 test steps still use 8080's base http password
for the admin test user. As usual with the core framework, this requires
an http.password_replica entry in [3] locally; cf. [4].

[1] https://gerrit-documentation.storage.googleapis.com/Documentation/3.0.9/dev-e2e-tests.html#_environment_properties
[2] export JAVA_OPTS="-Dcom.google.gerrit.scenarios.project=CheckMasterBranchReplica1"
[3] e2e-tests/src/test/resources/application.conf
[4] https://gerrit-documentation.storage.googleapis.com/Documentation/3.0.9/dev-e2e-tests.html#_project_and_http_credentials

Feature: Issue 12813
Change-Id: I224d365f978bbd4cf419312ebf7116f9557d7c95

e2e-tests/src/test/resources/data/com/google/gerrit/scenarios/CheckMasterBranchReplica1.json

@@ -0,0 +1,5 @@
+[
+  {
+    "url": "http://HOSTNAME:HTTP_PORT1/a/projects/PROJECT/branches/master"
+  }
+]

e2e-tests/src/test/resources/data/com/google/gerrit/scenarios/GetMasterBranchRevision.json

@@ -0,0 +1,5 @@
+[
+  {
+    "url": "http://HOSTNAME:HTTP_PORT/a/projects/PROJECT/branches/master"
+  }
+]