Merge pull request #7 from opensciencegrid/master

DST Root CA X3 can also sign the ISRG Root X1 (take 2)

Author: jbasney

trustid-x3-root.signing_policy

@@ -1,3 +1,3 @@
 access_id_CA   X509    '/O=Digital Signature Trust Co./CN=DST Root CA X3'
 pos_rights     globus  CA:sign
-cond_subjects  globus  '"/C=US/O=Let\'s Encrypt/CN=Let\'s Encrypt Authority X3" "/C=US/O=Let\'s Encrypt/CN=Let\'s Encrypt Authority X4" "/C=US/O=Let\'s Encrypt/CN=R3" "/C=US/O=Let\'s Encrypt/CN=R4"'
+cond_subjects  globus  '"/C=US/O=Let\'s Encrypt/CN=Let\'s Encrypt Authority X3" "/C=US/O=Let\'s Encrypt/CN=Let\'s Encrypt Authority X4" "/C=US/O=Let\'s Encrypt/CN=R3" "/C=US/O=Let\'s Encrypt/CN=R4" "/C=US/O=Internet Security Research Group/CN=ISRG Root X1"'