Extend NMSG Unit Tests

[kadealicious]

LCOV coverage report shows the following increase in coverage:

• Line coverage: 58.9% -> 67.6%
• Function coverage: 68.0% -> 84.3%

This MR contains the following changes:

• Add LCOV coverage report option at configuration time.
• Add 5 new unit tests for message modules, socket fragmentation, ZMQ endpoints, kicker files, and daemonization.
• Remove some unused IP fragment reassembly getter functions.
• Remove auto-generated protobuf-c files from code coverage output.
• Create new (defanged) sample data files.

To generate a coverage report for nmsg-1.2.0 (the current version on the next branch):

make -j
make dist
tar -xvf nmsg-1.2.0.tar.gz
rm nmsg-1.2.0.tar.gz
cd nmsg-1.2.0
./configure --with-coverage
make -j
make check -j
make report-coverage -j
your-browser coverage-html/index.html

[shw700]

These unit tests (make check) fail for me on my laptop. I just confirmed that the same is NOT the case for either the master or next branches.

[kadealicious]

These unit tests (make check) fail for me on my laptop. I just confirmed that the same is NOT the case for either the master or next branches.

This has been addressed.

[shw700]

I'm not sure if we should just tag @reedjc in here from the start or wait until it moves past all the devs... I expect he'll be reading through this very closely at some point.