Fix "trove module-instances" command which don't work.
Fix "trove module-instances" command which don't work.

The "trove module-instances" command don't work.

cat <<EOF>> myping.data
message=Module.V1
EOF

trove module-create myping ping myping.data

trove module-apply \
      7d95769f-1912-4e77-8b86-d9a4eb48cd2e myping
trove module-instances myping
ERROR: Module with ID 7d95769f-1912-4e77-8b86-d9a4eb48cd2e \
could not be found.

Change-Id: I30c2e698bd1ea90cc8fdf0dc5e3a5b087ca2bec2
Closes-Bug: #1664472

openstack/python-troveclient,openstack/python-troveclient