scap/__init__.py: Remove cruft

Remove unreferenced all_applications() function. all_applications()
has been unreferenced since it was first added by Mukunda in 2016 in
deac80e2.

Remove the any() call which references a bunch of symbols that were
imported earlier in the file. The comment on this expression
indicates that the purposes was to use the symbols to avoid unused
import warnings, but I don't get any such warning when the expression
is removed. It looks like flake8 is smart enough to consider the
entries in __all__ as symbol references.