deb: unify in one source package blksnap-dev, blksnap-tools and blksnap tests
Note: this unify only source packages, binaries package are keeped
splitted as should be.
This is another step to have packages more similar to the possible
official ones.
I keeped blksnap-dkms out as is better keep separate as it would remain
only the necessary time while waiting for kernel integration, then it
would be removed (still talking about possible official packages)
deb: unify in one source package blksnap-dev, blksnap-tools and blksnap tests
Note: this unify only source packages, binaries package are keeped splitted as should be. This is another step to have packages more similar to the possible official ones. I keeped blksnap-dkms out as is better keep separate as it would remain only the necessary time while waiting for kernel integration, then it would be removed (still talking about possible official packages)
Updated also circleci and README