Rewrite --init-storage: dump a compiled-in blob in it

Rewrite --init-storage to dump a compiled-in blob
instead of firing off the entire save snapshot machinery.

This should simplify bootstrap in presence of system
spaces:
there's going to be no need to implement the
code which creates system, they will be created
simply by recovery from a snapshot.
Merge branch 'master' into dict-v5

Conflicts:
	src/bootstrap.snap
	src/box/box.cc