glance-manage does not display basic options if run without any arguments

[Louis Taylor]

glance-manage isn't very helpful if it is run without any arguments. Compare against nova-manage and cinder-manage:

$ nova-manage
usage: nova-manage [-h] [--config-dir DIR] [--config-file PATH] [--debug]
                   [--log-config-append PATH] [--log-date-format DATE_FORMAT]
                   [--log-dir LOG_DIR] [--log-file PATH] [--log-format FORMAT]
                   [--nodebug] [--nouse-syslog] [--nouse-syslog-rfc-format]
                   [--noverbose] [--syslog-log-facility SYSLOG_LOG_FACILITY]
                   [--use-syslog] [--use-syslog-rfc-format] [--verbose]
                   [--version] [--remote_debug-host REMOTE_DEBUG_HOST]
                   [--remote_debug-port REMOTE_DEBUG_PORT]
                   {version,bash-completion,shell,logs,db,vm,agent,host,flavor,vpn,floating,project,account,network,service,cell,fixed}
                   ...
nova-manage: error: too few arguments

$ cinder-manage

OpenStack Cinder version: 2014.2

/usr/local/bin/cinder-manage category action [<args>]
Available categories:
        db
        volume
        host
        shell
        logs
        service
        config
        version
        backup

Glance-manage, on the other hand shows very little extra information:

$ glance-manage
usage: glance-manage [options] <cmd>
glance-manage: error: too few arguments

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/158654

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/158654
Committed: https://git.openstack.org/cgit/openstack/glance/commit/?id=fd2057d5211486bb22392a91a04316a9a75758bc
Submitter: Jenkins
Branch: master

commit fd2057d5211486bb22392a91a04316a9a75758bc
Author: Kamil Rykowski <email address hidden>
Date: Tue Feb 24 12:49:22 2015 +0100

    glance-manage output when ran without any arguments

    The glance-manage command isn't very helpful when it is run without any
    arguments. The current output looks like following:

    $ glance-manage
    usage: glance-manage [options] <cmd>
    glance-manage: error: too few arguments

    This patch extends the default output to look similar to what can be
    seen in the cinder-manage tool. The new output is:

    $ glance-manage
    /usr/local/bin/glance-manage category action [<args>]
    Available categories:
     db

    Change-Id: I2c56ccf5a28cdaf9fdfb03d79763b34dc096a858
    Closes-Bug: #1394316