Added complete Doc Convention to config-reference guide.

backport: havana

Change-Id: I0936caed5cac45373df9bbc077f66bcfa2f96b58
Partial-Bug: #1121866
Rename metering to Telemetry in user guide.

Change-Id: Ib8f07733eca388a48d28efe5f4a3c6af13b5c825
Document neutron-ovs-cleanup

Adds some documentation about the need to run neutron-ovs-cleanup
to ensure that DHCP agent and L3 agent perform properly on reboot.

Closes-Bug: 1156861

Change-Id: I556a15bd2aed18513a57eced465476181097e01d
backport: havana
Change the name of Metering to new name Telemetry in install guide.

backport: havana
Change-Id: I45b9394f22e5dd630a505acd30685bb33dbb60fd
Merge "Document neutron-ovs-cleanup"
Merge "Added complete Doc Convention to config-reference guide."
Merge "Change the name of Metering to new name Telemetry in install guide."
Merge "Rename metering to Telemetry in user guide."