L1(Topo) Installation Fixes, master branch (2020.04.03.)

Made the L1 packages install themselves correctly in case of build failures. This way in case the file generation commands in them fail for some reason, the nightly will not be prevented from installing fully.

I ran into these imperfections while working on !31741 (merged), and not being able to properly install (with make install/fast) the configured release for testing purposes, without building it first.

Note that I also made some additional cleanups in the code while at it:

• The whole "release recompilation" concept was abandoned a very long time ago in AtlasCMake. So I removed remnants of it from these packages.
• Updated the commands to use the built-in CMake variables/commands a little better. (For a better platform independence...)

This merge request affects 2 packages:

• Trigger/TrigT1/L1Common
• Trigger/TrigT1/L1Topo/L1TopoHardware

Adding @kwhalen ,@afaulkne as watchers

added Trigger master review-pending-level-1 labels

CI Result SUCCESS (hash d01e4e12)

	Athena	AthSimulation	AnalysisBase
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 4
AthSimulation: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 11850]

This looks OK, and the warnings are unrelated. I will approve, do we expect @kwhalen or @afaulkne to pop through?

MLB (L1)

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit c1b2a3ed

added sweep:ignore label