remove wait-for-endpoint logs that were only useful during development
remove wait-for-endpoint logs that were only useful during development

this cleans up the output quite a bit.

BEFORE:

2017/11/04 00:41:21 using busybox
2017/11/04 00:41:21 waiting for cassandra:9042 to become up...
2017/11/04 00:41:21 returned value 1, expecting 143
2017/11/04 00:41:22 waiting for cassandra:9042 to become up...
2017/11/04 00:41:22 returned value 1, expecting 143
2017/11/04 00:41:23 waiting for cassandra:9042 to become up...
2017/11/04 00:41:23 returned value 1, expecting 143
2017/11/04 00:41:24 waiting for cassandra:9042 to become up...
2017/11/04 00:41:24 returned value 1, expecting 143
2017/11/04 00:41:25 waiting for cassandra:9042 to become up...
2017/11/04 00:41:25 returned value 1, expecting 143
2017/11/04 00:41:26 waiting for cassandra:9042 to become up...
2017/11/04 00:41:26 returned value 1, expecting 143
2017/11/04 00:41:27 waiting for cassandra:9042 to become up...
2017/11/04 00:41:27 returned value 1, expecting 143
2017/11/04 00:41:28 waiting for cassandra:9042 to become up...
2017/11/04 00:41:28 returned value 1, expecting 143
2017/11/04 00:41:29 waiting for cassandra:9042 to become up...
2017/11/04 00:41:29 returned value 1, expecting 143
2017/11/04 00:41:30 waiting for cassandra:9042 to become up...
2017/11/04 00:41:30 returned value 1, expecting 143
2017/11/04 00:41:31 waiting for cassandra:9042 to become up...
2017/11/04 00:41:31 returned value 1, expecting 143
2017/11/04 00:41:32 waiting for cassandra:9042 to become up...
2017/11/04 00:41:32 returned value 1, expecting 143
2017/11/04 00:41:33 waiting for cassandra:9042 to become up...
2017/11/04 00:41:33 returned value 1, expecting 143
2017/11/04 00:41:34 waiting for cassandra:9042 to become up...
Terminated
2017/11/04 00:41:37 cassandra:9042 is up. maintained connection for 3 seconds!
2017/11/04 00:41:37 [I] Metrictank starting. Built from 0.7.4-292-g4512748b - Go version go1.9.2

AFTER:

2017/11/04 00:42:45 waiting for cassandra:9042 to become up...
2017/11/04 00:42:46 waiting for cassandra:9042 to become up...
2017/11/04 00:42:47 waiting for cassandra:9042 to become up...
2017/11/04 00:42:48 waiting for cassandra:9042 to become up...
2017/11/04 00:42:49 waiting for cassandra:9042 to become up...
2017/11/04 00:42:50 waiting for cassandra:9042 to become up...
2017/11/04 00:42:51 waiting for cassandra:9042 to become up...
2017/11/04 00:42:52 waiting for cassandra:9042 to become up...
2017/11/04 00:42:53 waiting for cassandra:9042 to become up...
2017/11/04 00:42:54 waiting for cassandra:9042 to become up...
2017/11/04 00:42:55 waiting for cassandra:9042 to become up...
2017/11/04 00:42:56 waiting for cassandra:9042 to become up...
2017/11/04 00:42:57 waiting for cassandra:9042 to become up...
2017/11/04 00:42:58 waiting for cassandra:9042 to become up...
2017/11/04 00:43:01 cassandra:9042 is up. maintained connection for 3 seconds!
2017/11/04 00:43:01 [I] Metrictank starting. Built from 0.7.4-293-g7307e71d - Go version go1.9.2

raintank/raintank-metric,raintank/metrictank,raintank/metrictank,raintank/raintank-metric,raintank/metrictank,replay/metrictank,raintank/raintank-metric,replay/metrictank,replay/metrictank,replay/metrictank,raintank/metrictank