---running verify 
issuer and attribute cert have mismatched principals

issuer cert still valid
attribute cert still valid
issuer and attribute cert have matching principals

issuer cert still valid
attribute cert still valid
10410:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:650:Expecting: CERTIFICATE
creddy: Can't load issuer cert from Acme_private.pem
I/O warning : failed to load external entity "bad.xml"
10412:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:650:Expecting: CERTIFICATE
creddy: Can't load issuer cert from Acme_buy_rockets__Acme_preferred_customer_attr.xml
creddy: Can't load issuer cert from bad.xml