Comment 4 for bug 1600171

Reviewed: https://review.openstack.org/341904
Committed: https://git.openstack.org/cgit/openstack/congress/commit/?id=1b606a010d0b5ddb3cf77aca1e06e7a7bbc2ab3c
Submitter: Jenkins
Branch: master

commit 1b606a010d0b5ddb3cf77aca1e06e7a7bbc2ab3c
Author: Eric K <email address hidden>
Date: Thu Jul 14 18:18:55 2016 -0700

    API routing to intranode PE

    Implements the HA task to make API route PE requests to same-node PE

    Also combined with changes for fast failure on requesting
    non-existent service, because many changes shared.

    Basic idea is to first ping the service with a short timeout, then
    on success, send actual request with longer timeout.

    New DSE config parameters:
    dse_ping_timeout: timeout for pinging a service
    dse_long_timeout: timeout for potentially long requests such as row
        query on PE and action exec on DSD

    Closes-Bug: 1600171
    Closes-Bug: 1600011
    Closes-Bug: 1599991
    Partially implements blueprint: high-availability-design

    Change-Id: Ia31f70df89c8a92d441e2c197b23dc8cabc4e464