Generate EtcdInitialClusterToken

Add EtcdInitialClusterToken to constants so
the etcd token will be generated during the deployment.

Change-Id: I6e30cce469736e84a3c483fafa29d542b8347ba9
Partial-Bug: #1673266

releasenotes/notes/etcdtoken-4c46bdfac940acda.yaml

@@ -0,0 +1,7 @@
+---
+security:
+  - |
+    Add EtcdInitialClusterToken to the list of passwords
+    to generate, so users don't have to pick a string or
+    rely on a default value.
+    Fixes `bug 1673266 <https://bugs.launchpad.net/tripleo/+bug/1673266>`__.

tripleo_common/constants.py

@@ -70,6 +70,7 @@ PASSWORD_PARAMETER_NAMES = (
     'CinderPassword',
     'CongressPassword',
     'Ec2ApiPassword',
+    'EtcdInitialClusterToken',
     'GlancePassword',
     'GnocchiPassword',
     'HAProxyStatsPassword',

tripleo_common/tests/actions/test_parameters.py

@@ -65,6 +65,7 @@ _EXISTING_PASSWORDS = {
     'KeystoneFernetKey1': 'AueoL37kd6eLjV29AG-Ruxu5szW47osgXx6aPOqtI6I=',
     'CephClusterFSID': u'97c16f44-b62c-11e6-aed3-185e0f73fdc5',
     'Ec2ApiPassword': 'FPvz2WiWxrHVWrmSSvv44bqmr',
+    'EtcdInitialClusterToken': 'fcVZXehsSc2KdmFFMKDudxTLKa',
     'PacemakerRemoteAuthkey':
         'bCfHQx4fX7FqENVBbDfBnKvf6FTH6mPfVdNjfzakEjuF4UbmZJHAxWdheEr6feEyZmtM'
         'XEd4w3qM8nMVrzjnDCmqAFDmMDQfKcuNgTnqGnkbVUDGpym67Ry4vNCPHyp9tGGyfjNX'