increase number of keys for GetUnitTest.testFailoverAndMultiGet
increase number of keys for GetUnitTest.testFailoverAndMultiGet

Change-Id: I4db1cd4ad88df682aa9ca2bb6678a5b723472a49
Reviewed-on: http://review.couchbase.org/c/libcouchbase/+/141593
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,kojiromike/libcouchbase,kojiromike/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase