jigsaw system property names

[Vincent Ryan]

During testing and deployment it is sometimes necessary to override
the system cacerts file (in ${java.home}/lib/security/cacerts).
Especially in the case of jigsaw as it is an OPENJDK repository so it
builds an empty cacerts file, by default.

I'd like to propose a new system property that specifies the file
path to an alternative cacerts file. For example,

    org.openjdk.system.security.cacerts

Is there an existing naming convention for system properties in jigsaw?