bat: Improve TestDeleteAllInstances robustness
bat: Improve TestDeleteAllInstances robustness

TestDeleteAllInstances periodically fails if the cluster still contains
some instances after the ciao-cli instance delete --all command has
executed.  As this command doesn't wait until the instances have actually
been deleted this is not surprising.  This commit modifies the test case
to give controller 5 seconds to delete all the instances after the
ciao-cli instance delete command has returned.

Signed-off-by: Mark Ryan <f16215f7acd0bd7fdc465539215bd574c785b062@intel.com>

erick0z/ciao,mrkz/ciao,wcwxyz/ciao,mcastelino/ciao,mrkz/ciao,rbradford/ciao,tpepper/ciao,kaccardi/ciao,markdryan/ciao,tpepper/ciao,matthewrsj/ciao,mcastelino/ciao,mcastelino/ciao,obedmr/ciao,matthewrsj/ciao,kaccardi/ciao,mrkz/ciao,erick0z/ciao,wcwxyz/ciao,matthewrsj/ciao,ciao-project/ciao,rbradford/ciao,tpepper/ciao,01org/ciao,erick0z/ciao,markdryan/ciao,obedmr/ciao,wcwxyz/ciao,obedmr/ciao,ciao-project/ciao,01org/ciao