unittests: Simplify and make test_templates more reliable

env.detect_<lang>_compiler only checks that there is a binary called
whatever that returns a version. There are several cases where the found
binary doesn't work:
 1) gcc for ojbc[pp], when support isn't compiled in.
 2) the compiler is broken (rust in appveyor somtimes)
Because of that we need to call compiler.sanity_check() as well, and if
we get an EnvironmentException from that skip the language

Also, instead of having a long line of try: ... except: pass, roll all
of the checking up into a loop using getattr(), which is less code and
makes adding a new language easier

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