fix ldb_test TtlPutGet test

Summary:
If the last byte of the timestamp is 0, the output value of the ttl db
can cut off earlier. Change to compare hex format instead.

Test Plan:
this does not happen consistently, but it did not fail after the last
100 runs
for i in {1..100}; do python ./tools/ldb_test.py; done

Reviewers: igor, haobo

Reviewed By: igor

CC: leveldb

Differential Revision: https://reviews.facebook.net/D16725

tools/ldb_test.py

@@ -205,10 +205,12 @@ class LDBTestCase(unittest.TestCase):
     def testTtlPutGet(self):
         print "Running testTtlPutGet..."
         self.assertRunOK("put a1 b1 --ttl --create_if_missing", "OK")
-        self.assertRunOK("scan ", "a1 : b1", True)
+        self.assertRunOK("scan --hex", "0x6131 : 0x6231", True)
         self.assertRunOK("dump --ttl ", "a1 ==> b1", True)
+        self.assertRunOK("dump --hex --ttl ",
+                         "0x6131 ==> 0x6231\nKeys in range: 1")
         self.assertRunOK("scan --hex --ttl", "0x6131 : 0x6231")
-        self.assertRunOK("get a1", "b1", True)
+        self.assertRunOK("get --value_hex a1", "0x6231", True)
         self.assertRunOK("get --ttl a1", "b1")
         self.assertRunOK("put a3 b3 --create_if_missing", "OK")
         # fails because timstamp's length is greater than value's