appc/discovery: update test to new discovery
cas: update tests
mkrootfs.sh: add flags for dlsym

-Wl,--no-as-needed flags for gcc to avoid issue with dlsym
Merge pull request #191 from ghigt/fix-flags

mkrootfs.sh: add --no-as-needed linker flag to fakesdboot.so build
Merge pull request #181 from jonboulle/tests

*: fix up broken tests
stage0: clear up rootfs unpacking error propagation
stage0: support uncompressed (tar) rootfs images
Merge pull request #197 from jonboulle/err

stage0: clear up rootfs unpacking error propagation