Would you mind to review the following patch?
bug: https://bugs.openjdk.java.net/browse/JDK-8158194
webrev: Rename the directory "InstalledModuleDescriptors" and any
reference to "installed" to "system" in the tests
Renamed "InstalledModuleDescriptorPlugin" to
"SystemModuleDescriptorPlugin"
(jdk/tools/jlink/internal/plugins/SystemModuleDescriptorPlugin.java)
before jigsaw was integrated to jdk9.
We also need to rename the directory "InstalledModuleDescriptors"
(test/tools/jlink/plugins/InstalledModuleDescriptors) and any reference
to "installed" to "system" in the tests
Thank you
-Hamlin