transport: ssh, fixes override HostKeyCallback from DefaultClient

Signed-off-by: Máximo Cuadros <[email protected]>

Author: mcuadros

Diff for: plumbing/transport/ssh/common.go

@@ -154,9 +154,7 @@ func overrideConfig(overrides *ssh.ClientConfig, c *ssh.ClientConfig) {
 		f := t.Field(i)
 		vcf := vc.FieldByName(f.Name)
 		vof := vo.FieldByName(f.Name)
-		if isZeroValue(vcf) {
-			vcf.Set(vof)
-		}
+		vcf.Set(vof)
 	}
 
 	*c = vc.Interface().(ssh.ClientConfig)

Diff for: plumbing/transport/ssh/common_test.go

@@ -37,5 +37,5 @@ func (s *SuiteCommon) TestOverrideConfigKeep(c *C) {
 	}
 
 	overrideConfig(config, target)
-	c.Assert(target.User, Equals, "bar")
+	c.Assert(target.User, Equals, "foo")
 }