Instead of multiple uploads to each node, this script copies everything
as needed to the temporary directory, exactly as to be installed in the
destination machine, then runs only one rsync per host.

This is more dangerous (we can break /etc now), but for development
machines is fine.

The patch then also uploads the bash completions and the current name
for the cron job (I think that ganeti-master-cron is a deprecated name,
not that someone actually intends to upload a file named like that). A
flag --no-cron is added to skip uploading the cron file if desired.

The patch also changes rsync to propagate the file permissions.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

When an upload is done to a node which doesn't have any version of
ganeti installed, this prevents a non-executable-initd error later in
the upload.

Reviewed-by: imsnah

Reviewed-by: imsnah

If --no-restart is passed to devel/upload, it'll not run
"/etc/init.d/ganeti restart" (which kills processes), making
debugging on a terminal a bit easier.

Reviewed-by: iustinp, ultrotter

This change allows us to use cleaner dependencies between
directories. The build system is basically rewritten in large parts
and may contain bugs.

Reviewed-by: iustinp

- Use variable with prefix instead of grep and sed
- Always run with /bin/bash

Reviewed-by: ultrotter

Files are uploaded to $prefix/sbin, not $prefix/bin

Reviewed-by: iustinp

The upload tool can be used to submit the current code to an arbitrary list of
nodes. This helps developers in easily testing their changes before submitting
them.

Reviewed-by: iustinp