MM_DumpInEventCmd wastes event characters

[skliper]

In MM_DumpInEventCmd, including the "0x" and trailing space on the hex digits unnecessarily limits how much can actually be dumped in the event.

Imported from GSFCCFS-1564

[thnkslprpt]

I had a go at this but the unit tests don't seem to test what has been changed exactly.
Is there a way that the memory dump can be tested directly?

[dzbaker]

Issue is being re-opened to address in Equuleus-rc2.