Added an hdf5_compression_test and restored a couple of the existing tests

[bieryAtFnal]

The main point of this PR is to add an integration test to verify the correct operation of the HDF5 compression code. The new test is called hdf5_compression_test.py.

As part of improving the dfmodules integtest generally, the v4 multi_output_file_test.py has been split into max_file_size_test.py and multiple_data_writers_test.py, both of which are now operational in v5.x. Several of the other existing tests still need to be updated for v5.

There were also some read-ability changes to integtests, copied from ones in the daqsystemtest repo. And, there were some updates to the dfmodules_integtest_bundle.sh script, copying improvements from the similar script in daqsystemtest.

To test these changes, I recommend running the 3 available integtests multiple times, such as with a command like dfmodules_integtest_bundle.sh -N 3 --stop-on-fail.

I'll post instructions soon for creating a software area to test these changes.

[bieryAtFnal]

Not surprisingly, if we locally-modify the compression_levels specified in the hdf5_compression_test so that compression is turned off, the test does not complete successfully.

This is good news, and a nice confirmation that the test is doing some meaningful checks, IMO.

[bieryAtFnal]

Here are suggested instructions for creating a software area and running a test:

DATE_PREFIX=`date '+%d%b'`
TIME_SUFFIX=`date '+%H%M'`

source /cvmfs/dunedaq.opensciencegrid.org/setup_dunedaq.sh
setup_dbt fddaq-v5.3.1
dbt-create -b candidate fddaq-v5.3.2-rc2-a9 ${DATE_PREFIX}FDv5.3.2rc2Test_${TIME_SUFFIX}
cd ${DATE_PREFIX}FDv5.3.2rc2Test_${TIME_SUFFIX}/sourcecode

git clone https://github.com/DUNE-DAQ/daqconf.git -b kbiery/nonzero_slots_for_PDS
git clone https://github.com/DUNE-DAQ/daqsystemtest.git -b patch/fddaq-v5.3.x
git clone https://github.com/DUNE-DAQ/dfmodules.git -b kbiery/various_integtest_changes
cd ..

dbt-workarea-env
dbt-build -j 12
dbt-workarea-env

daqconf_set_connectivity_service_port local-1x1-config config/daqsystemtest/example-configs.data.xml

dfmodules_integtest_bundle.sh --stop-on-fail

[andrewmogan]

I ran the dfmodules test bundle as suggested and can confirm all the tests pass. I also see that, if I set the compression_level to 0 for either stream, I get the appropriate error corresponding to too many files being created due to exceeding the maximum file size. Thanks for doing this!