Comment 7 for bug 1478154

Reviewed: https://review.opencontrail.org/12654
Committed: http://github.org/Juniper/contrail-controller/commit/d69d6d50c85e88b9ada9557d6cc7840cb20a999f
Submitter: Zuul
Branch: R2.20

commit d69d6d50c85e88b9ada9557d6cc7840cb20a999f
Author: Nischal Sheth <email address hidden>
Date: Fri Jul 24 14:26:15 2015 -0700

Support pagination of output for instance config introspect

Limit the maximum number of entries displayed on a single page. A
next_batch link is generated if there are more entries to display.

Also limit maximum number of entries examined in one invocation of
the callback routine. This comes into play when there is a search
string specified and many entries don't match it. A partial page
is saved in user-allocated data and the next invocation of callback
appends to it. This is repeated till there's a full page or there
are no more entries in the table.

Following changes are implemented:

- Add class template BgpShowHandler to facilitate code reuse
- Move code from bgp_sandesh.cc to bgp_show_config.cc
- Implement iteration limit to avoid hogging CPU from introspect
- Reuse typed tests to also cover instance config
- Fix a few typos in comments for typed tests

Change-Id: I48389edd40fd099539210723690d6cbad317efa8
Closes-Bug: 1478154