No longer tracking tests that are expected to fail in state file.
Fix for Linux systems that have the perf tool but don't support
measuring instructions.

This is primarily to fix the test suite in that case, btest itself
already dealt with it (though it deals with it now more nicely :).
Work-around for systems reporting that a socket path is too long.

Addresses BIT-862 but don't have a way to test.

BIT-862 #close