Provide more flexibility in route introspect prefix match

[Nischal Sheth]

Route introspect allows exact and longer/shorter match for prefixes.
Provide more flexibility by allowing a regex search for prefixes.
This will be particularly helpful for vpn tables and for evpn/ermvpn
tables since one can now match using the RD or MAC address etc.

The specifiex prefix string should be treated as a regex and the
string representation of each route prefix searched against it.

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/28686
Submitter: Nischal Sheth (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/28686
Committed: http://github.org/Juniper/contrail-controller/commit/5cca03efd678b300c85721940e18a30406a06147
Submitter: Zuul (<email address hidden>)
Branch: master

commit 5cca03efd678b300c85721940e18a30406a06147
Author: Nischal Sheth <email address hidden>
Date: Fri Feb 10 11:04:23 2017 -0800

Allow prefix string in route introspect to be a perl-style regex

The specified prefix string is treated as a regex and the string
representation of each route prefix searched for the regex. Note
that the regex need not match the entire string representation of
a prefix - it only has to match a sub-sequence.

Shorter and longer matches are not supported when using a regex.

Change-Id: Ie6c8db700524b4fd02f3f4ae36c5dd91c0ce4fc0
Closes-Bug: 1663752

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/28877
Submitter: Nischal Sheth (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/28877
Committed: http://github.org/Juniper/contrail-controller/commit/387c769e7355af2462e27a3c5c02db3dbdc43ffc
Submitter: Zuul (<email address hidden>)
Branch: R3.2

commit 387c769e7355af2462e27a3c5c02db3dbdc43ffc
Author: Nischal Sheth <email address hidden>
Date: Fri Feb 10 11:04:23 2017 -0800

Allow prefix string in route introspect to be a perl-style regex

The specified prefix string is treated as a regex and the string
representation of each route prefix searched for the regex. Note
that the regex need not match the entire string representation of
a prefix - it only has to match a sub-sequence.

Shorter and longer matches are not supported when using a regex.

Change-Id: Ie6c8db700524b4fd02f3f4ae36c5dd91c0ce4fc0
Closes-Bug: 1663752
(cherry picked from commit 5cca03efd678b300c85721940e18a30406a06147)