ceilometer_snmpd_password unset with --no-undercloud

[Steven Hardy]

When running in an environment where you deploy from the seed (no undercloud), it seems that we're missing a variable for the SNMP password, which later causes an error when puppet finds an empty key on the controller/compute nodes:

devtest_overcloud.sh does this:

os-apply-config -m /home/shardy/tripleo/testenv.json --key undercloud.ceilometer_snmpd_password --type raw --key-default ''

but we get an empty string because testenv doesn't contain the password.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/161882

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/161882
Committed: https://git.openstack.org/cgit/openstack/tripleo-incubator/commit/?id=310b557430a7dc6fbf6db892fde7fd4ad7ce6a58
Submitter: Jenkins
Branch: master

commit 310b557430a7dc6fbf6db892fde7fd4ad7ce6a58
Author: Steven Hardy <email address hidden>
Date: Thu Mar 5 15:37:05 2015 -0500

    Fall back to generated snmp password with --no-undercloud

    Running devtest_overcloud.sh via devtest with --no-undercloud seems
    to result in some puppet errors recently, due to the zero-length
    password in the heiradata key.

    So instead of passing a zero length password, fall back to generating
    one in the event no password is found via the undercloud key of the
    test environment.

    Change-Id: Ia5f9fff1ea3b50f372489a42647e3f47bc219df8
    Closes-Bug: #1428726