Fix rhbz # 1587824. With experimental-allowed-unsafe-sysctls,

"*" is a valid character now as part of kubelet arguments.

pkg/cmd/server/origin/node/node.go

@@ -15,7 +15,7 @@ import (
 // safeArgRegexp matches only characters that are known safe. DO NOT add to this list
 // without fully considering whether that new character can be used to break shell escaping
 // rules.
-var safeArgRegexp = regexp.MustCompile(`^[\da-zA-Z\-=_\.,/\:]+$`)
+var safeArgRegexp = regexp.MustCompile(`^[\da-zA-Z\-=_\.,/\:\*]+$`)
 
 // shellEscapeArg quotes an argument if it contains characters that my cause a shell
 // interpreter to split the single argument into multiple.