build:add script to sort netbsd sets and sort minix/mi.

Change-Id: I309d8bbcfe2f5b6d5e1ae7626422c4402985ad1d
build:add tool to convert from METALOG to proto files.

Change-Id: I5c4e15b1a2bac5a4ca3a0530f8d6aa2643ac720a
build:refactor arm_sdimage.sh as to no longer require root.

There where two reasons for needing root access while making ARM builds. The
first reason was that we needed root permissions to create device nodes and
assign permissions to files. The second reason we needed root was that we used
loop mounted files to copy the build output to the file backed storage.

The first problem is solved by building in unprivileged mode (adding -U) during
compilation. The second problem is solved by using mcopy to put files on the
fat partition and use the mkfs.mfs proto files to create MFS file system.

Future work might be to replace this script by the netbsd makefs tool.

Change-Id: Ibba61d4cad053f7c1ede26169d5214065a4939d8