vstart: cleanup echoed commands and sh issues

vstart: cleanup echoed commands and sh issues

o Add prun/prunb for echoing out a command and running it.
o Add quotes around some variables to prevent word splitting.
o Use "$@" instead of $* or (it is incorrect but often works anyway).
o Sprinkle in some extra command prints.
o Use function for ceph_adm rather than command prefixing.

I also corrected some whitespace where tab/spaces were mixed in the diff.

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>