Update crashtests to match D12267

Summary: I changed the db_stress configs, but forgot to update the scripts using the old configs.

Test Plan: 'make blackbox_crash_test' and 'make whitebox_crash_test' start running normally now (I haven't run them til the end, though).

Reviewers: vamsi

Reviewed By: vamsi

CC: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D12303

tools/db_crashtest.py

@@ -90,6 +90,9 @@ def main(argv):
                         --destroy_db_initially=0 \
                         --reopen=0 \
                         --readpercent=50 \
+                        --prefixpercent=5 \
+                        --writepercent=40 \
+                        --delpercent=5 \
                         --db=' + dirpath + '\
                         --max_key=100000000 ' + additional_opts],
                                  stderr=subprocess.PIPE, shell=True)

tools/db_crashtest2.py

@@ -107,6 +107,9 @@ def main(argv):
                 --destroy_db_initially=0 ' + killoption + ' \
                 --reopen=0 \
                 --readpercent=50 \
+                --prefixpercent=5 \
+                --writepercent=40 \
+                --delpercent=5 \
                 --db=' + dirpath + ' \
                 --max_key=100000000 ' + additional_opts]