[FEATURE]: remove compilers dynamically via command line

[shahzebsiddiqui]

Please describe your feature request

It would be nice to remove the compilers from command line via buildtest config compilers rm <compiler> to remove a compiler from the configuration file and update the configuration upon completion. This could be useful if one wants to remove an outdated compiler.

For instance buildtest config compilers rm gcc_6.5.0 will remove a compiler name gcc_6.5.0 which is the name of the compiler (entry in buildtest cg compilers)

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