JDITest failing on openjdk8_openj9 x86-64 Linux with JDWP option sysntax error

JDITest is failing on openjdk8_openj9 x86-64 Linux with JDWP option sysntax error as follows:
>ASI1 stderr ERROR: JDWP option syntax error: -agentlib:jdwp=transport=dt_socket,address=30000,timeout=300000,trace=PROG+CMD+PACK+DATA

Build URL: https://ci.adoptopenjdk.net/view/System%20tests/job/openjdk8_j9_systemtest_x86-64_linux/26/

JDITest is also failing on openjdk9_openj9 Linux x86-x64 build, but with a different error:

>ERROR: transport error 202: recv failed during handshake: Connection reset by peer
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [debugInit.c:730]

Build URL: https://ci.adoptopenjdk.net/view/System%20tests/job/openjdk9_j9_systemtest_x86-64_linux/

Start with JDITest and reproduce the failures from the linked openjdk8_j9_systemtest_x86-64_linux and openjdk9_j9_systemtest_x86-64_linux builds. Trace how each build configures JDWP and determine the expected behavior; the work is done when JDITest passes on both OpenJDK/OpenJ9 Linux configurations.

Written by the indexing model from the issue text.