The TAP tests of src/test/ssl/ have been using rather generic matching
patterns to check some failure scenarios, like "SSL error" or just
"FATAL".  These have been introduced in 081bfc19.

Those messages are not wrong per se, but when working on the integration
of new SSL libraries it becomes hard to know if those errors are legit
or not, and existing scenarios may fail in incorrect ways.  This commit
makes all those messages more verbose by adding the information
generated by OpenSSL.  Fortunately, the same error messages are used for
all the versions supported on HEAD (checked that after running the tests
from 1.0.1 to 1.1.1), so the change is straight-forward.

Reported-by: Jacob Champion, Álvaro Herrera
Discussion: https://postgr.es/m/YGU3AxQh0zBMMW8m@paquier.xyz