jdb should call VirtualMachine.canBeModified() and if it returns false,
jdb should avoid calling JDI methods speced to throw the VMCannotBeModifiedException. In addition, jdb should give meaningful
error messages to the user if the user tries a jdb command that would
result in calling one of these methods.

For pluggable connector support, jdb -help should be changed to output
a list of available connectors, and info about their parameters.
The use can then use any of these connectors via jdb's -connect option.
###@###.### 2003-10-15

Name: ipR10196 Date: 05/17/2004


The following tests were added to testbase_vm to check
JDB support for read-only SA-JDI pluggable connectors:

  nsk/sajdi/jdb/options/connect/connect001
  nsk/sajdi/jdb/options/connect/connect002
  nsk/sajdi/jdb/options/connect/connect003
  nsk/sajdi/jdb/options/connect/connect004
  nsk/sajdi/jdb/options/listconnectors/listconnectors001

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