creds contains user certificate, private key and config.
user config:
{
"name":"PeerAdmin",
"mspid":"Org1MSP",
"roles":null,
"affiliation":"",
"enrollmentSecret":"",
"enrollment":{
"signingIdentity":"<>",
"identity":{
"certificate":"-----BEGIN CERTIFICATE-----\n\n-----END CERTIFICATE-----\n"
}
}
}