convert bash to python for the bootzip creator script

PS4: added fstab check and some cleanup

oldChange-Id: Icff7d5ac7e2b442f1ffe5c4c11e02aa0b18333f3

Conflicts:
	core/Makefile

Change-Id: Ic232d8d19a3ef5264eabd3299aee6678e7f500c6