Fix home direcroty path in trovestack script
Fix home direcroty path in trovestack script

This simple fix solves "no such file or directory" error when user
home directory is not prefixed by /home.

This is the case, for example in devstack, where stack user home is
set to /opt/stack/.

Lets use $HOME variable to determine user home location.

Change-Id: I07432d27e1a2035296bc62793fecbe13d0265e7b
Signed-off-by: Marcin Piwowarczyk <82f77c3faa2d9bd1e8b9270de3963c7aed2ed46e@samsung.com>

openstack/trove,openstack/trove