java.c: add support for -agentlib JVM option

This is needed to start the JVM with debugger interface.

Signed-off-by: Tomasz Grabiec <tgrabiec@cloudius-systems.com>
imgedit: introduce getargs command

The new command prints arguments set in the image.

Signed-off-by: Tomasz Grabiec <tgrabiec@cloudius-systems.com>
run.py: convert tab to spaces

In order to have consistent indentation.

Signed-off-by: Tomasz Grabiec <tgrabiec@cloudius-systems.com>
run.py: start QEMU in nographic mode

This is in order to make it send Ctrl+C to the guest instead
of killing the VM. Leads to less surprises when working with
interactive shell inside OSv.

To suppress the new behavior run with --g or --with-graphic.

Relates to issue #49.

Signed-off-by: Tomasz Grabiec <tgrabiec@cloudius-systems.com>