oauth_validator: Print captured stderr after call-count failure
If the call count test fails, you'll reasonably want to know what the
network trace looked like, but that information is currently swallowed.
Print it out instead.
Backpatch-through: 18
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/6222233159728963cc0183d7c80fb66fc444a113
Modified Files
--------------
src/test/modules/oauth_validator/t/001_server.pl | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
