TUN-528: Move cloudflared into a separate repo

vendor/gopkg.in/urfave/cli.v2/altsrc/input_source_context.go

@@ -0,0 +1,25 @@
+package altsrc
+
+import (
+	"time"
+
+	"gopkg.in/urfave/cli.v2"
+)
+
+// InputSourceContext is an interface used to allow
+// other input sources to be implemented as needed.
+//
+// Source returns an identifier for the input source. In case of file source
+// it should return path to the file.
+type InputSourceContext interface {
+	Source() string
+
+	Int(name string) (int, error)
+	Duration(name string) (time.Duration, error)
+	Float64(name string) (float64, error)
+	String(name string) (string, error)
+	StringSlice(name string) ([]string, error)
+	IntSlice(name string) ([]int, error)
+	Generic(name string) (cli.Generic, error)
+	Bool(name string) (bool, error)
+}