project: use vndr for vendoring

Signed-off-by: Alexander Morozov <lk4d4@docker.com>

vendor/github.com/RackSec/srslog/framer.go

@@ -0,0 +1,24 @@
+package srslog
+
+import (
+	"fmt"
+)
+
+// Framer is a type of function that takes an input string (typically an
+// already-formatted syslog message) and applies "message framing" to it. We
+// have different framers because different versions of the syslog protocol
+// and its transport requirements define different framing behavior.
+type Framer func(in string) string
+
+// DefaultFramer does nothing, since there is no framing to apply. This is
+// the original behavior of the Go syslog package, and is also typically used
+// for UDP syslog.
+func DefaultFramer(in string) string {
+	return in
+}
+
+// RFC5425MessageLengthFramer prepends the message length to the front of the
+// provided message, as defined in RFC 5425.
+func RFC5425MessageLengthFramer(in string) string {
+	return fmt.Sprintf("%d %s", len(in), in)
+}