Description of problem:
3 tests from glib-networking-tests package are failing on Fedora Rawhide.

glib-networking/certificate.test
glib-networking/connection.test
glib-networking/file-database.test

Version-Release number of selected component (if applicable):
glib-networking-tests-2.55.2-1.fc28.x86_64
kernel-4.15.0-0.rc9.git0.1.fc28.x86_64
gnutls-3.6.1-3.fc28.x86_64

How reproducible:
100%

Steps to Reproduce:
1.dnf install -y glib-networking-tests gnome-desktop-testing

2.ginsttest-runner glib-networking/certificate.test glib-networking/connection.test glib-networking/file-database.test 
Running test: glib-networking/certificate.test
/tls/certificate/create-pem: OK
/tls/certificate/create-der: OK
/tls/certificate/create-with-key-pem: OK
/tls/certificate/create-with-key-der: OK
/tls/certificate/create-with-issuer: OK
/tls/certificate/create-chain: OK
/tls/certificate/create-no-chain: OK
/tls/certificate/create-list: OK
/tls/certificate/create-list-bad: OK
/tls/certificate/verify-good: **
GLib-Net:ERROR:../tls/tests/certificate.c:379:test_verify_certificate_good: assertion failed (errors == 0): (34 == 0)
FAIL: glib-networking/certificate.test (Child process killed by signal 6)
Running test: glib-networking/connection.test
/tls/connection/basic: OK
/tls/connection/verified: **
GLib-Net:ERROR:../tls/tests/connection.c:527:test_verified_connection: assertion failed (test->read_error == NULL): Unacceptable TLS certificate (g-tls-error-quark, 2)
FAIL: glib-networking/connection.test (Child process killed by signal 6)
Running test: glib-networking/file-database.test
/tls/backend/default-database-is-singleton: OK
/tls/database/verify-good: **
GLib-Net:ERROR:../tls/tests/file-database.c:117:test_verify_database_good: assertion failed (errors == 0): (34 == 0)
FAIL: glib-networking/file-database.test (Child process killed by signal 6)
SUMMARY: total=3; passed=0; skipped=0; failed=3; user=0.1s; system=0.0s; maxrss=17732
FAIL: glib-networking/certificate.test (Child process killed by signal 6)
FAIL: glib-networking/connection.test (Child process killed by signal 6)
FAIL: glib-networking/file-database.test (Child process killed by signal 6)