C0103 fixes 3, dht, k_bucket and routing_table

This PR is dependent on #1108.
Since `findValue` was [renamed](https://github.com/OpenBazaar/OpenBazaar/pull/1110/files#diff-a27252223b036b86e2bda1843335baafR124) to `find_value`, this should be changed similarly to [line 758](https://github.com/OpenBazaar/OpenBazaar/pull/1110/files#diff-a27252223b036b86e2bda1843335baafR758).