IF: remove chain_pacemaker and qc_chain related files

[linh2931]

Remove chain_pacemaker and qc_chain related files and tests. Do the removal now so that we don't need to maintain the tests using qc_chain and chain_pacemaker while making changes to common files.

Porting tests to work with the new implementation is tracked by #2147.

Resolved #2123.

[greg7mdp]

lgtm, but I'm wondering if before removing all the tests that existed for the qc_chain implementation, we should not at least review them, and convert those which make sense for our new implementation of IF?

[heifner]

lgtm, but I'm wondering if before removing all the tests that existed for the qc_chain implementation, we should not at least review them, and convert those which make sense for our new implementation of IF?

That is what #2147 is for.

[linh2931]

The adapting of the tests will be done by #2147 (It will be a significant work). The tests being removed do not cover any new implementation; removing them does not reduce our existing test coverage but saves us from updating them just for compile whenever we change some common data types.

[ericpassmore]

Note:start
group: IF
category: TEST
summary: Remove original pacemaker code and update tests to match current working code.
Note: end