Increase cert ttl from 80days to 4000days

Vault testing is failed if we want to
increase vault's default ttl to 10 years
because zaza specify cert's ttl is only 80days.

https://review.opendev.org/#/c/678161

zaza/openstack/utilities/cert.py

@@ -190,7 +190,7 @@ def sign_csr(csr, ca_private_key, ca_cert=None, issuer_name=None,
         datetime.datetime.today() - datetime.timedelta(1, 0, 0),
     )
     builder = builder.not_valid_after(
-        datetime.datetime.today() + datetime.timedelta(80, 0, 0),
+        datetime.datetime.today() + datetime.timedelta(4000, 0, 0),
     )
     builder = builder.subject_name(new_csr.subject)
     builder = builder.public_key(new_csr.public_key())