tst_test.sh: Reduce false positives in reserved variable warnings

"Reserved variable TST_FOO used!" and "Private variable or function
_tst_foo used!" reports some false positive.

Filter out commented code and variables and functions not starting with
searched prefix (foo_tst_bar() or $foo_tst_bar).

NOTE: There are still some false positives (e.g. echo "echo
TST_SHOULD_NOT_BE_FOUND"), but let's not complicate the regexp too much.

Acked-by: Cyril Hrubis <chrubis@suse.cz>
Signed-off-by: Petr Vorel <pvorel@suse.cz>

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