Extend loop limit by 1.

Extend the loop count by 1 to account for non-exact timing in usleep(100000).

[==========] Running 6 test(s).
[ RUN      ] getoriginnode_test
[       OK ] getoriginnode_test
[ RUN      ] getsetservestalettl_test
[       OK ] getsetservestalettl_test
[ RUN      ] dns_dbfind_staleok_test
21 is not within the range 0-20
db_test.c:214: error: Failure!

[  FAILED  ] dns_dbfind_staleok_test
[ RUN      ] class_test
[       OK ] class_test
[ RUN      ] dbtype_test
[       OK ] dbtype_test
[ RUN      ] version_test
[       OK ] version_test
[==========] 6 test(s) run.
[  PASSED  ] 5 test(s).
[  FAILED  ] 1 test(s), listed below:
[  FAILED  ] dns_dbfind_staleok_test

 1 FAILED TEST(S)
FAIL db_test (exit status: 1)

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