RFR:8148103:add more tests for task "Update JDI and JDWP for modules"

[Alexander Kulyakhtin]

Hi,

Could you, please, review the following test-only change (adding a new test):

CR: https://bugs.openjdk.java.net/browse/JDK-8148103
Webrev: http://cr.openjdk.java.net/~akulyakh/8148103_02/

The new test verifies the new JDWP commands: AllModules, Module, Name, ClassLoader, CanRead.

It does so by launching a debuggee java program  with the necessary JDWP-related options, so that a JDWP session can be established between the debuggee and the test.

When started the debuggee reports its loaded modules to the test.
The test then initiates the JDWP session and issues AllModules command to get the modules info by means of the JDWP.
For each module the test issues Name command. It then verifies that the modules names reported via the JDWP are the same as reported by the debuggee using the Java API.
Additionally, for each module the test issues CanRead and Classloader commands and verifies that the corresponding replies are correct.

Since all the previous JDWP tests were implemented using the deprecated closed test framework, the amount of the code for this test is slightly larger than usually for a single test.
The simple JDWP framework, created for this test, allows for porting the other JDWP tests to the jtreg in the same manner.

Best regards,
Alexander