Allow user to skip or select datatypes with aperf

[janaknat]

Two new options are provided for the user to configure the data collected with aperf.

• collect_only - select only the datatypes to collect.
• skip_only - select only the datatypes to not collect.

Update the integration tests to run in its own process with rusty-fork. This allows each intergration to run as a stand alone, as is expected.

Added a report which compares 2 runs. 1 run was run and only collected interrupts. The other run skipped only the vmstat and interrupts.

skip_collect.tar.gz

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.