Disabled requiretty in cloud-init script

Sahara expects requiretty to be disabled. Usually we disable it in
diskimagebuilder. Disabling it in runtime to be able to use stock
images.

Change-Id: I62bfd6db5ce9cbf6ab3c3a33d0053f0c4166082a
Closes-Bug: #1399052
Update oslo-incubator policy

Changes -
 * Improving docstrings for policy API
 * Don't log missing policy.d as a warning
 * Add rule overwrite flag to Enforcer class
 * Fixed a problem with neutron http policy check
 * Expanding the help text for policy_dirs
 * policy: add a missing staticmethod declaration
 * Fixes nits in module policy
 * add list_opts to all modules with configuration options
 * Correct default rule name for policy.Enforcer
 * Minor fixes in policy module
 * Delete graduated serialization files
 * Remove code that moved to oslo.i18n
 * Allow dictionary lookup in credentials with dot notation
 * Fix typo to show correct log message

Change-Id: I87c39f2c2588114f1be7f375df33ec0c4c6f930b
Update oslo-incubator threadgroup

Changes -
 * threadgroup: don't log GreenletExit

Change-Id: I41e76ce9e4d50883619b1336a99cca0ec42fffeb
Update oslo-incubator periodic_task

Changes -
 * add list_opts to all modules with configuration options
 * Remove code that moved to oslo.i18n

Change-Id: I165a99328f4af979c1de43aa13430a6eb6938cff
Fixed configs generation for vanilla2

Plugin has convention that config should contain configs only for
existing services. Initialization with empty dict leads to copy of
all configuration files.

Change-Id: I53090f95c657ef5ef215a3654476ffebf4826cf4
Closes-Bug: #1399822
All user preserve EDP objects after test

User can enable RETAIN_EDP_AFTER_TEST option to presever EDP objects
after integration test. This is only for debug usage.

Closes-Bug: #1401736

Change-Id: I7051efb0beda6640e4c1d39994146599b6827528
Enable HDFS NameNode High Availability with HDP 2.0.6 plugin

Extend HDP 2.0.6 plugin to include the setup and configuration of the
HDFS NameNode High Availability after creating and configuring
the cluster.

Change-Id: I32116d42453bd3470b65bf863cf493f27301dab7
Implements: blueprint hdp-plugin-enable-hdfs-ha
Merge "Disabled requiretty in cloud-init script"
Merge "Fixed configs generation for vanilla2"
Merge "All user preserve EDP objects after test"
Merge "Update oslo-incubator policy"
Merge "Update oslo-incubator threadgroup"
Merge "Update oslo-incubator periodic_task"