Merge branch 'wip/dueno/aia-api' into 'master'

x509: check certificate trust status when adding CA through AIA

Closes #1100

See merge request gnutls/gnutls!1354

diff --cc lib/x509/common.c
Simple merge

diff --cc lib/x509/ocsp.c
Simple merge

diff --cc lib/x509/x509.c
Simple merge