• Turn off unit tests by default. It is getting harder to maintain because

there are too many possible combinations with current set of build options.
Also, this significantly reduces build time. Use TEST option to enable it.

• Implement SAL getOSVersion() for FreeBSD. Actually, I believe it should

work with all supported UNIX-like OSes including Linux.

• Install stripped binaries. 'install-strip' target was not honored because

'distro-pack-install' target unconditionally depends on 'install' target.

• Fix couple of minor installation issues while I am here.