Comment 12 for bug 1709260

Reviewed: https://review.openstack.org/585334
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=2caf8f65e414732fb1ef1ac32a5884a48af6655d
Submitter: Zuul
Branch: stable/queens

commit 2caf8f65e414732fb1ef1ac32a5884a48af6655d
Author: Rajesh Tailor <email address hidden>
Date: Fri Aug 18 12:33:09 2017 +0530

    Make host_aggregate_map dictionary case-insensitive

    As of now, if hostname is set as "compute0.example.com" (in lower case)
    and user tries to add this host to host-aggregate but by-mistake types
    "COMPUTE0.example.com" (in capital case), then instead of throwing
    HostNotFound error, that host is successfully added to host-aggregate
    as "COMPUTE0.example.com". And after that if instance creation request
    with flavor matching metadata as host-aggregate metadata comes, this
    host is not filtered by scheduler, since there is no host with hostname
    COMPUTE0.example.com, as added in host-aggregate.

    Fixed the issue by lowercasing all hostnames in host_aggregate_map
    dictionary.

    Change-Id: Iee4b9bbf412adfdc6fdc62ea3429fb960d6ac2a2
    Closes-Bug: 1709260
    (cherry picked from commit 0dc0db932e3ad5ad911f2072015cb9854f6e4e23)