Prior to this commit, when the guest capability attempted to expand a
path with spaces it would quote the path passed in. However if the path
also had a relative path those quotes would end up making `printf`
ignore it and not properly expand the path fully. This commit updates
that to first escape the quotes of a path and then pass in the new path
to be expanded.
The `pkg_add` command will return `0` when a package requested for
installation is not found. This adds a validation check to ensure
the rsync package is actually installed on the guest.
Brian Cain
Chris Roberts