Fix use of %s instead of %+v, from go 1.8 vet

.travis.yml

@@ -2,6 +2,6 @@ language: go
 
 go:
     - 1.6.3
-    - 1.7.3
+    - 1.7.4
     - 1.8beta1
     - master

hostfile_test.go

@@ -141,7 +141,7 @@ func TestParseLineMultiHostnameComment(t *testing.T) {
 		!hosts.Contains(hostess.MustHostname("domain.com", "66.33.99.11", false)) ||
 		len(hosts) != 2 {
 		t.Error("Expected to find domain.com and test.domain.com (disabled)")
-		t.Errorf("Found %s", hosts)
+		t.Errorf("Found %+v", hosts)
 	}
 }
 

hostlist_test.go

@@ -82,12 +82,12 @@ func TestContainsDomainIp(t *testing.T) {
 
 	expectedHostname := hostess.MustHostname(domain, ip, true)
 	if !hosts.Contains(expectedHostname) {
-		t.Errorf("Expected to find %s", expectedHostname)
+		t.Errorf("Expected to find %+v", expectedHostname)
 	}
 
 	extraneousHostname := hostess.MustHostname("yahoo.com", "4.3.2.1", false)
 	if hosts.Contains(extraneousHostname) {
-		t.Errorf("Did not expect to find %s", extraneousHostname)
+		t.Errorf("Did not expect to find %+v", extraneousHostname)
 	}
 }
 

hostname_test.go

@@ -27,10 +27,10 @@ func TestEqual(t *testing.T) {
 	c := hostess.MustHostname("localhost", "127.0.1.1", false)
 
 	if !a.Equal(b) {
-		t.Errorf("%s and %s should be equal", a, b)
+		t.Errorf("%+v and %+v should be equal", a, b)
 	}
 	if a.Equal(c) {
-		t.Errorf("%s and %s should not be equal", a, c)
+		t.Errorf("%+v and %+v should not be equal", a, c)
 	}
 }
 
@@ -55,7 +55,7 @@ func TestIsValid(t *testing.T) {
 		IPv6:    true,
 	}
 	if !hostname.IsValid() {
-		t.Fatalf("%s should be a valid hostname", hostname)
+		t.Fatalf("%+v should be a valid hostname", hostname)
 	}
 }
 
@@ -67,7 +67,7 @@ func TestIsValidBlank(t *testing.T) {
 		IPv6:    true,
 	}
 	if hostname.IsValid() {
-		t.Errorf("%s should be invalid because the name is blank", hostname)
+		t.Errorf("%+v should be invalid because the name is blank", hostname)
 	}
 }
 func TestIsValidBadIP(t *testing.T) {
@@ -78,7 +78,7 @@ func TestIsValidBadIP(t *testing.T) {
 		IPv6:    true,
 	}
 	if hostname.IsValid() {
-		t.Errorf("%s should be invalid because the ip is malformed", hostname)
+		t.Errorf("%+v should be invalid because the ip is malformed", hostname)
 	}
 }