CBQE-2963 TestDropAllIndexesWithDataLoad: Add a delay after index drop
CBQE-2963 TestDropAllIndexesWithDataLoad: Add a delay after index drop

GSIClient returns success for index drop operation after internally
accepting and updating metadata during the drop command. Drop is
performed asynchronously. Added a delay 1s to account for this property.

Change-Id: I0ff19e72612cf293cafa4de36e89ebc0ae9d3ea4

jchris/indexing,jchris/indexing,jchris/indexing,jchris/indexing