Use daemon flag only when USE_SCREEN=False

This patch removes the daemon option, when devstack is started
with USE_SCREEN=True.

Change-Id: Ib3b1c0b2abf9111b767b3d557dacdc7a89a38f59
ceilometer.conf configuration option missing os_auth_url

ceilometer-agent-centrol error connection keystone: \
Skip interval_task because Keystone error: \
Authorization Failed: Unable to establish connection to
http://localhost:5000/v2.0/tokens

Fixed bug #1320951

Change-Id: Iae722595cb51e11e604d373779d74a8968ea3324
Merge "Use daemon flag only when USE_SCREEN=False"
Merge "ceilometer.conf configuration option missing os_auth_url"