Unify the type of value for what are True/False values

[Hiroyuki Eguchi]

A bootable field in cinder volume data returned from cinder-api is a string data type.
However, a crypted field is a boolean data type.

{"volumes": [
 {"status": "available",
 "user_id": "b398614e552a4250a8e9d6c5079c74fa",
 "attachments": [],
 "links": [],
 "availability_zone": "nova",
★ "bootable": "false",
★ "encrypted": false,
     ...

The type of value which can be True or False should be boolean.

This issue is causing a another issue in horizon.
https://bugs.launchpad.net/horizon/+bug/1587263

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/330339

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/331400

[OpenStack Infra (hudson-openstack)]

Change abandoned by Sean McGinnis (<email address hidden>) on branch: master
Review: https://review.openstack.org/330339
Reason: This review is > 4 weeks without comment, and failed Jenkins the last time it was checked. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and leaving a 'recheck' comment to get fresh test results.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Hiroyuki Eguchi (<email address hidden>) on branch: master
Review: https://review.openstack.org/331400

[Ken'ichi Ohmichi (oomichi)]

The change of cinder was denied on the cinder side, and I think this report of tempest is not necessary now.

[Sean McGinnis (sean-mcginnis)]

Unassigning due to no activity for > 6 months.