fix(coreos-base/coreos-dev): Remove sys-process/time

make.conf has a work-around to support cross compiling this tool but we
don't actually need it. Cleanup and remove the tool and the work-around.
fix(make.conf): Remove AT_SYS_M4DIR

Autotools is provided by the SDK chroot, not the board sysroot.
Presumably at some point in the ChromeOS past some macros were being
installed the other way around in the sysroot but not the SDK chroot.
Currently this is not the case, so this extra variable can go away.
fix(sys-apps/baselayout): Do not set default password in ebuild

Setting the 'core' user's password is now always handled by cloud
config. As an added benefit this will let us use baselayout as a binary
package now that it doesn't depend on random state it the local SDK.
bump(coreos-base/vboot_reference): Minor code cleanup.

Removes currently unused code in cgpt resize.
Merge pull request #616 from marineam/cleanup

Minor cleanups