Add stub for doll-master and doll services, add required vendored libs

vendor/github.com/carlmjohnson/requests/cookies.go

@@ -0,0 +1,18 @@
+package requests
+
+import (
+	"net/http"
+	"net/http/cookiejar"
+
+	"golang.org/x/net/publicsuffix"
+)
+
+// NewCookieJar returns a cookie jar using the standard public suffix list.
+func NewCookieJar() http.CookieJar {
+	jar, err := cookiejar.New(&cookiejar.Options{PublicSuffixList: publicsuffix.List})
+	// As of Go 1.16, cookiejar.New err is hardcoded nil
+	if err != nil {
+		panic(err)
+	}
+	return jar
+}