Adding old root cert that is still used in staging.

tools/autograph-monitor/constants.go

@@ -140,6 +140,49 @@ RIpKO53Cd7aV5PdB0pNSPNjc6V+5IPrepALNQhKIpzoHA4oG+LlVVy4R3csPcj4e
 zQQ9gt3NC2OXF4hveHfKZdCnb+BBl4S71QMYYCCTe+EDCsIGuyXWD/K2hfLD8TPW
 thPX5WNsS8bwno2ccqncVLQ4PZxOIB83DFBFmAvTuBiAYWq874rneTXqInHyeCq+
 819l9s72pDsFaGevmm0Us9bYuufTS5U=
+-----END CERTIFICATE-----`,
+	// previous content signing root cert
+	`-----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----`,
 }