Since delv can occasionally hang in system tests when running with TSAN
(see GL#4119), disable these tests as a workaround. Otherwise, the hung
delv process will just waste CI resources and prevent any meaningful
output from the rest of the test suite.
(cherry picked from commit
fbcf37f914ed83cab374e01d13e0ce302c87ab52)
export CHECKZONE=$TOP/bin/check/named-checkzone
export COVERAGE=$TOP/bin/python/dnssec-coverage
export DDNSCONFGEN=$TOP/bin/confgen/ddns-confgen
-export DELV=$TOP/bin/delv/delv
+if [ -z "$TSAN_OPTIONS" ]; then # workaround for GL#4119
+ export DELV=$TOP/bin/delv/delv
+else
+ export DELV=:
+fi
export DIG=$TOP/bin/dig/dig
export DNSTAPREAD=$TOP/bin/tools/dnstap-read
export DSFROMKEY=$TOP/bin/dnssec/dnssec-dsfromkey