Added -r option to usage

Added the -r option, which starts the radosgw and apache2 to access it
to the usage message.

Signed-off-by: Christophe Courtaut <christophe.courtaut@gmail.com>
Added manpage for vstart.sh

Creation of a manpage for the vstart.sh utility to describe
how to use it.

Signed-off-by: Christophe Courtaut <christophe.courtaut@gmail.com>