Changes

Adjust tests for changes in Go 1.12.8 / 1.11.13
``` 00:38:11 === Failed 00:38:11 === FAIL: opts
TestParseDockerDaemonHost (0.00s) 00:38:11     hosts_test.go:87: tcp
tcp:a.b.c.d address expected error "Invalid bind address format:
tcp:a.b.c.d" return, got "parse tcp://tcp:a.b.c.d: invalid port
\":a.b.c.d\" after host" and addr 00:38:11     hosts_test.go:87: tcp
tcp:a.b.c.d/path address expected error "Invalid bind address format:
tcp:a.b.c.d/path" return, got "parse tcp://tcp:a.b.c.d/path: invalid
port \":a.b.c.d\" after host" and addr 00:38:11 00:38:11 === FAIL: opts
TestParseTCP (0.00s) 00:38:11     hosts_test.go:129: tcp tcp:a.b.c.d
address expected error Invalid bind address format: tcp:a.b.c.d return,
got parse tcp://tcp:a.b.c.d: invalid port ":a.b.c.d" after host and addr 
00:38:11     hosts_test.go:129: tcp tcp:a.b.c.d/path address expected
error Invalid bind address format: tcp:a.b.c.d/path return, got parse
tcp://tcp:a.b.c.d/path: invalid port ":a.b.c.d" after host and addr
```
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>