`stop_dstat` function was extracted into $TOP_DIR/lib/dstat in commit e0b08d04ab41f9aca96997c87bd9fa13feba2536 but the new lib was not sourced in unstack.sh. Change-Id: I6878552d9f384fdd7882e52000b37ac6a60844c3 Closes-Bug: 1366713
@@ -55,6 +55,7 @@ source $TOP_DIR/lib/heat
source $TOP_DIR/lib/neutron
source $TOP_DIR/lib/baremetal
source $TOP_DIR/lib/ldap
+source $TOP_DIR/lib/dstat
# Extras Source
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