Merge pull request #143 from audioscience/cleanup

mrp: explicitly define spacing for MRP event #defines
Update to igb_stable 5.2
Merge pull request #144 from eric-mann/open-avb-next

Update to igb_stable 5.2
Remove some active but useless lines from MMRP

The code removed seems to be leftover copy-paste mess from MVRP;
it is incorrect in MMRP, but the correct operation is done at the
beginning of the function and the leftover lines don't have any
ill effect due to the NULL check in the called code.

There should be no runtime behavioral change due to this.
Merge pull request #148 from pinealservo/fix_mmrp_147

Remove some active but useless lines from MMRP
mrp: testing, add ability to count events per MSRP attrib type

This update provides more information on what attrib type was associated
with a generated event.
mrp: test, improve event checking