Merge remote-tracking branch 'origin/1.5'

.gitmodules

@@ -70,3 +70,6 @@
 [submodule "vendor/github.com/pkg/profile"]
 	path = vendor/github.com/pkg/profile
 	url = https://github.com/pkg/profile
+[submodule "vendor/github.com/j-keck/arping"]
+	path = vendor/github.com/j-keck/arping
+	url = https://github.com/j-keck/arping