There is no ability to specify the GPG public keys for package repositories for bootstrap image

[Ilya Kharin]

In some cases there is a necessity to have custom repositories wtih packages for the bootstrap image. fuel-menu supports a custom list of repositories but it does not support to specify GPG public keys and fuel-agent does not support of adding these keys during building bootstrap images. To support it some changes should be made on two levels such as:

- fuel-menu should support of adding keys for repositories
- fuel-agent should import specified GPG public keys in chroot before to fetch some metadata of repositories

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/274909

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/275021

[OpenStack Infra (hudson-openstack)]

Change abandoned by Fuel DevOps Robot (<email address hidden>) on branch: master
Review: https://review.openstack.org/275021
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 Ilya Kharin (<email address hidden>) on branch: master
Review: https://review.openstack.org/274909
Reason: I should give this change a second thought.