Update github.com/spf13/pflag and github.com/spf13/cobra

Update:
  github.com/spf13/cobra to f62e98d28ab7ad31d707ba837a966378465c7b57
  github.com/spf13/cobra/doc to f62e98d28ab7ad31d707ba837a966378465c7b57
  github.com/spf13/pflag to 1560c1005499d61b80f865c04d39ca7505bf7f0b

Closes issue #29852

vendor/github.com/spf13/pflag/golangflag.go

@@ -61,6 +61,9 @@ func (v *flagValueWrapper) Type() string {
 }
 
 // PFlagFromGoFlag will return a *pflag.Flag given a *flag.Flag
+// If the *flag.Flag.Name was a single character (ex: `v`) it will be accessiblei
+// with both `-v` and `--v` in flags. If the golang flag was more than a single
+// character (ex: `verbose`) it will only be accessible via `--verbose`
 func PFlagFromGoFlag(goflag *goflag.Flag) *Flag {
 	// Remember the default value as a string; it won't change.
 	flag := &Flag{
@@ -71,6 +74,10 @@ func PFlagFromGoFlag(goflag *goflag.Flag) *Flag {
 		//DefValue: goflag.DefValue,
 		DefValue: goflag.Value.String(),
 	}
+	// Ex: if the golang flag was -v, allow both -v and --v to work
+	if len(flag.Name) == 1 {
+		flag.Shorthand = flag.Name
+	}
 	if fv, ok := goflag.Value.(goBoolFlag); ok && fv.IsBoolFlag() {
 		flag.NoOptDefVal = "true"
 	}