give correct metric name for grep in regression script

Summary: as title

Test Plan: jenkin

Reviewers: igor

Reviewed By: igor

Subscribers: leveldb

Differential Revision: https://reviews.facebook.net/D19005

build_tools/regression_build_test.sh

@@ -398,5 +398,5 @@ send_benchmark_to_ods readrandom readrandom_fillunique_random $STAT_FILE.readran
 send_benchmark_to_ods fillrandom memtablefillrandom $STAT_FILE.memtablefillreadrandom
 send_benchmark_to_ods readrandom memtablereadrandom $STAT_FILE.memtablefillreadrandom
 send_benchmark_to_ods readwhilewriting readwhilewriting $STAT_FILE.readwhilewriting
-send_benchmark_to_ods readwhilewriting_in_ram readwhilewriting_in_ram ${STAT_FILE}.readwhilewriting_in_ram
-send_benchmark_to_ods seekwhilewriting_in_ram seekwhilewriting_in_ram ${STAT_FILE}.seekwhilewriting_in_ram
+send_benchmark_to_ods readwhilewriting readwhilewriting_in_ram ${STAT_FILE}.readwhilewriting_in_ram
+send_benchmark_to_ods seekrandomwhilewriting seekwhilewriting_in_ram ${STAT_FILE}.seekwhilewriting_in_ram