Allow search in link table introspect to include the metadata field too

[Tapan Karwa]

Allow the link table introspect to filter entries based on the metadata field too.
Add another search box where the user enters the substring that he wants the metadata field to match with.

The input in the search string box will be used as a substring to search the names of the left and right nodes as before. The input in the new metadata search box will be used as a substring to match the metadata field.

If both the search boxes are filled in, they must both match for the output to be non-empty.
If either (but not both) of the search boxes are non-empty, that particular search string will be used to filter output entries.
If both the search boxes are empty, all the entries will be displayed in the output.

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/20938
Submitter: Tapan Karwa (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/20938
Committed: http://github.org/Juniper/contrail-controller/commit/11f2a1f289d66e4d58c49adf91e95c7fc9637100
Submitter: Zuul
Branch: master

commit 11f2a1f289d66e4d58c49adf91e95c7fc9637100
Author: Tapan Karwa <email address hidden>
Date: Fri Jun 3 13:56:55 2016 -0700

Allow the link table introspect to filter entries based on the metadata field

Add another search box where the user enters the substring that he wants the
metadata field to match with.

The input in the search string box will be used as a substring to search the
names of the left and right nodes as before. The input in the new metadata
search box will be used as a substring to match the metadata field.

1. If both the search boxes are filled in, they must both match for the output
to be non-empty.
2. If either (but not both) of the search boxes are non-empty, that particular
search string will be used to filter output entries.
3. If both the search boxes are empty, all the entries will be displayed in the
output.

Change-Id: Idc263110ec9ef4743c886260369700add6c0b18b
Closes-Bug: #1588971