Fix #247, Move sample_libs into libraries dir

[astrogeco]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License agreement to [email protected] and copied [email protected].

Describe the contribution
Creates a new directory "libs" at the cFS bundle level to put libraries in. This will create a little more clarity between applications and libraries

Fixes #247

Testing performed
CI Ubuntu

Expected behavior changes
None, everything should still compile

System(s) tested on
Ubuntu 18.04

Additional context
Might require developers to fixup their local repos once change is merged

[skliper]

Consider postponing until Draco? Seems a bit unkind to break everyone's checked out bundle this late in the cycle.

[skliper]

Missing issue link.

[astrogeco]

I think the only way it would break is if people have local "non-main" sample_lib branches

[astrogeco]

CCB:2021-08-11 APPROVED

• Might need to have users "resync" their submodules