Crash in SDK_API_TSSslServerContextCreate regression tests

[bryancall]

Regression test segfaults after f729c9d / #6483 was committed.

10:00:51 bart:(master)~/dev/apache/trafficserver$ sudo /usr/local/bin/traffic_server -R 3 -r SDK_API_TSSslServerContextCreate
Traffic Server 10.0.0 Mar 13 2020 10:00:37 bart.bryancall.com
traffic_server: using root directory '/usr/local'
REGRESSION_TEST initialization begun
REGRESSION TEST SDK_API_TSSslServerContextCreate started
traffic_server: received signal 11 (Segmentation fault)
traffic_server - STACK TRACE:
/usr/local/bin/traffic_server(_Z19crash_logger_invokeiP9siginfo_tPv+0x92)[0x4cecf2]
/lib64/libpthread.so.0(+0x14b20)[0x7f0d6ee8ab20]
/usr/local/bin/traffic_server(_ZN24SSLMultiCertConfigLoader36load_certs_and_cross_reference_namesERSt6vectorIP7x509_stSaIS2_EERNS_12CertLoadDataEPK15SSLConfigParamsPK24SSLMultiCertConfigParamsRSt3setINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESt4lessISK_ESaISK_EERSt13unordered_mapIiSO_St4hashIiESt8equal_toIiESaISt4pairIKiSO_EEE+0x20)[0x751040]
/usr/local/bin/traffic_server(_Z22SSLCreateServerContextPK15SSLConfigParamsPK24SSLMultiCertConfigParamsPKcS6_+0x114)[0x753234]
/usr/local/bin/traffic_server(TSSslServerContextCreate+0x33)[0x4f0353]
/usr/local/bin/traffic_server(_Z47RegressionTest_SDK_API_TSSslServerContextCreateP14RegressionTestiPi+0xf)[0x51367f]
/usr/local/lib/libtscore.so.10(_ZN14RegressionTest3runEPKci+0xd9)[0x7f0d6f3c7629]
/usr/local/bin/traffic_server(_ZN14RegressionCont9mainEventEiP5Event+0x67)[0x510687]
/usr/local/bin/traffic_server(_ZN7EThread13process_eventEP5Eventi+0x30d)[0x7ab34d]
/usr/local/bin/traffic_server(_ZN7EThread15execute_regularEv+0x245)[0x7abfd5]
/usr/local/bin/traffic_server(_ZN7EThread7executeEv+0x1ee)[0x7ace9e]
/usr/local/bin/traffic_server[0x7aa9a9]
/lib64/libpthread.so.0(+0x94e2)[0x7f0d6ee7f4e2]
/lib64/libc.so.6(clone+0x43)[0x7f0d6ea4b6d3]
Segmentation fault