Fix #561, remove all deprecated code

[jphickey]

Describe the contribution
In the next major OSAL release, this code will be no longer supported at all. It should be removed early in the cycle
to avoid needing to maintain this compatibility code.

Fixes #561

Testing performed
Build on native, RTEMS, and VxWorks and Confirm no issues/errors.
Run all unit tests.
Sanity check CFE core.

Expected behavior changes
All old compatibility code is removed.

System(s) tested on
Ubuntu 20.04
RTEMS 4.11.3

Additional context
This code was already conditional on the OSAL_OMIT_DEPRECATED flag and as such the CCB has already tested/verified running the code in this configuration as part of CI scripts.

After this change, the build should be equivalent to the result of building with OMIT_DEPRECATED=true.

Contributor Info - All information REQUIRED for consideration of pull request
Joseph Hickey, Vantage Systems, Inc.

[astrogeco]

CCB 2020-08-19 APPROVED, Need more discussion about deprecation timeline.

[astrogeco]

@jphickey can we do an intermediate commit to rename OSAL_OMIT_DEPRECATED to OSAL_OMIT_DEPRECATED_5_0 before removing stuff. That way we can have a slightly more readable history. Thoughts?

[skliper]

@astrogeco - I thought we approved this one? Further discussion required on the topic of removing elements deprecated this cycle before the release of Caelum.

[astrogeco]

@astrogeco - I thought we approved this one? Further discussion required on the topic of removing elements deprecated this cycle before the release of Caelum.

Good point, I think that's what I was trying to say in my previous comment. Make sure there's nothing in the list that was deprecated for Caelum then remove anything that was deprecated for Bootes.

I'll edit the CCB comment to reflect approval status