do not abort on exception in clean installation
do not abort on exception in clean installation

Change-Id: Ia99c63a22b41c10039f135d8eda82768a18f5eb8
Reviewed-on: http://review.couchbase.org/53638
Reviewed-by: Venu Uppalapati <5c73d43f38c8de2bc4a2e4d15365e52f60b59dae@gmail.com>
Tested-by: Venu Uppalapati <5c73d43f38c8de2bc4a2e4d15365e52f60b59dae@gmail.com>

couchbase/perfrunner,pavel-paulau/perfrunner,mikewied/perfrunner,EricACooper/perfrunner,pavel-paulau/perfrunner,pavel-paulau/perfrunner,vmx/perfrunner,EricACooper/perfrunner,dkao-cb/perfrunner,EricACooper/perfrunner,couchbase/perfrunner,couchbase/perfrunner,pavel-paulau/perfrunner,pavel-paulau/perfrunner,thomas-couchbase/perfrunner,couchbase/perfrunner,EricACooper/perfrunner,couchbase/perfrunner,couchbase/perfrunner,vmx/perfrunner,dkao-cb/perfrunner,mikewied/perfrunner,thomas-couchbase/perfrunner