[Missed adding cmdline parsing for new flags added in D8685]

Summary:
I had added FLAGS_numdistinct and FLAGS_deletepercent for randomwithverify
but forgot to add cmdline parsing for those flags.

Test Plan:
[nponnekanti@dev902 /data/users/nponnekanti/rocksdb] ./db_bench --benchmarks=randomwithverify --numdistinct=500
LevelDB:    version 1.5
Date:       Thu Feb 21 10:34:40 2013
CPU:        24 * Intel(R) Xeon(R) CPU           X5650  @ 2.67GHz
CPUCache:   12288 KB
Keys:       16 bytes each
Values:     100 bytes each (50 bytes after compression)
Entries:    1000000
RawSize:    110.6 MB (estimated)
FileSize:   62.9 MB (estimated)
Compression: snappy
WARNING: Assertions are enabled; benchmarks unnecessarily slow
------------------------------------------------
Created bg thread 0x7fbf90bff700
randomwithverify :       4.693 micros/op 213098 ops/sec; ( get:900000 put:80000 del:20000 total:1000000 found:714556)

[nponnekanti@dev902 /data/users/nponnekanti/rocksdb] ./db_bench --benchmarks=randomwithverify --deletepercent=5
LevelDB:    version 1.5
Date:       Thu Feb 21 10:35:03 2013
CPU:        24 * Intel(R) Xeon(R) CPU           X5650  @ 2.67GHz
CPUCache:   12288 KB
Keys:       16 bytes each
Values:     100 bytes each (50 bytes after compression)
Entries:    1000000
RawSize:    110.6 MB (estimated)
FileSize:   62.9 MB (estimated)
Compression: snappy
WARNING: Assertions are enabled; benchmarks unnecessarily slow
------------------------------------------------
Created bg thread 0x7fe14dfff700
randomwithverify :       4.883 micros/op 204798 ops/sec; ( get:900000 put:50000 del:50000 total:1000000 found:443847)
[nponnekanti@dev902 /data/users/nponnekanti/rocksdb]
[nponnekanti@dev902 /data/users/nponnekanti/rocksdb] ./db_bench --benchmarks=randomwithverify --deletepercent=5 --numdistinct=500
LevelDB:    version 1.5
Date:       Thu Feb 21 10:36:18 2013
CPU:        24 * Intel(R) Xeon(R) CPU           X5650  @ 2.67GHz
CPUCache:   12288 KB
Keys:       16 bytes each
Values:     100 bytes each (50 bytes after compression)
Entries:    1000000
RawSize:    110.6 MB (estimated)
FileSize:   62.9 MB (estimated)
Compression: snappy
WARNING: Assertions are enabled; benchmarks unnecessarily slow
------------------------------------------------
Created bg thread 0x7fc31c7ff700
randomwithverify :       4.920 micros/op 203233 ops/sec; ( get:900000 put:50000 del:50000 total:1000000 found:445522)

Revert Plan: OK

Task ID: #

Reviewers: dhruba, emayanke

Reviewed By: dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D8769

db/db_bench.cc

@@ -1496,6 +1496,8 @@ int main(int argc, char** argv) {
       FLAGS_use_existing_db = n;
     } else if (sscanf(argv[i], "--num=%ld%c", &l, &junk) == 1) {
       FLAGS_num = l;
+    } else if (sscanf(argv[i], "--numdistinct=%ld%c", &l, &junk) == 1) {
+      FLAGS_numdistinct = l;
     } else if (sscanf(argv[i], "--reads=%d%c", &n, &junk) == 1) {
       FLAGS_reads = n;
     } else if (sscanf(argv[i], "--read_range=%d%c", &n, &junk) == 1) {
@@ -1565,6 +1567,9 @@ int main(int argc, char** argv) {
     } else if (sscanf(argv[i], "--readwritepercent=%d%c", &n, &junk) == 1 &&
                n > 0 && n < 100) {
       FLAGS_readwritepercent = n;
+    } else if (sscanf(argv[i], "--deletepercent=%d%c", &n, &junk) == 1 &&
+               n > 0 && n < 100) {
+      FLAGS_deletepercent = n;
     } else if (sscanf(argv[i], "--disable_data_sync=%d%c", &n, &junk) == 1 &&
         (n == 0 || n == 1)) {
       FLAGS_disable_data_sync = n;