Aligning JSON marshalled output for Properties similar to the XML counterpart.

Aligning JSON marshalled output for Properties similar to the XML counterpart.

After the Jackson migration (https://git.opendaylight.org/gerrit/#/c/1131), the marshalled JSON output
got misaligned from its XML counterpart. This is because of the "special" handling of XmlElementRef by
Jettison.
Please refer to http://pastebin.com/6kCSuddg for various marshalled JSON output for Jettison, Jackson and Moxy.

Having tried & exhausted various mechanisms (using Jackson and Moxy), finally decided to use the Jackson
annotations to take care of this requirement. Changes involves :

1. Modified NodeConnectProperties, EdgProperties and NodeProperties to use @JsonIgnore and @JsonProperty
2. Reverted a few NorthboundIT changes as prior to the gerrit#1131 version to align to the JSON format.
3. Added @XmlAccessorType(XmlAccessType.NONE) in all the Property classes to avoid including unnecessary data.

Change-Id: I574956328fa841b2165e0c10ddec995c70b76e4d
Signed-off-by: Madhu Venugopal <vmadhu@cisco.com>