Add directory in GitRepo and updated tests.

Update validate and gitRepo

Update generated code

pkg/api/v1/conversion_generated.go

@@ -826,6 +826,7 @@ func autoconvert_api_GitRepoVolumeSource_To_v1_GitRepoVolumeSource(in *api.GitRe
 	}
 	out.Repository = in.Repository
 	out.Revision = in.Revision
+	out.Directory = in.Directory
 	return nil
 }
 
@@ -3851,6 +3852,7 @@ func autoconvert_v1_GitRepoVolumeSource_To_api_GitRepoVolumeSource(in *GitRepoVo
 	}
 	out.Repository = in.Repository
 	out.Revision = in.Revision
+	out.Directory = in.Directory
 	return nil
 }