BUG 5746 - Ovsdb QoS and Queue model enhancements

BUG 5746 - Ovsdb QoS and Queue model enhancements

Update the QoS and Queue model to improve managability
of QoS and Queue tables via MD-SAL config model.

Adds code to update operational md-sal using updated
model.

Adds code to allow creation of queue and qos in same
transaction and assign queue to the qos row via
named-uuid.

QoS and Queue entries can be managed by ODL ID
values instead of needing to know the operational
UUID value.

Adds code to support assignment of QoS to port
by MD-SAL QoS ID.

Adds a QoS entry list to the termination point
model so updates and delete operations can be made
directly on the list instead of updating the
termination point.

Support for ingress policing rate and burst configuration
for interfaces is added.

Includes updated Postman examples.

v2 - clarify some logic based on comment feedback
     add additional qos types: linux-sfq, linux-codel
       linux-fq_codel, egress-policer
v3 - rebase, whitespace
v4 - address review comments
v5 - Changes to address review comments:
     Use a queue-ref (instance identifier instead
       of queue-id in the qos queue list.
     Use a qos-ref (instance identifier instead
       of qos-id in the port qos list.
     Use a key of '1' for the single item port qos list.
     Add instance identifer to the external-ids column
       of the qos and queue tables instead of just id
       value.  Use key of 'opendaylight-iid'.
     Updated the postman collection to account for changes
     Clarified the  comment and code of method
       bytesToHexString in TransactUtils.java.

Still to do:
- update unit tests
- update integration tests

Change-Id: I71ac462afe5a881c621fad9a3c5603e1aab8d021
Signed-off-by: Eric Multanen <eric.w.multanen@intel.com>