Missing suggestions for full qualified name in the assignment or the parameter

[ShinyaYoshida]

Hi,
I found missing suggestions for full qualified name in the assignment or
the parameter:

-> Optional<String> opt = java.u[TAB]

Currently, REPL doesn't suggest anything.
But it should do "util".

Here is the fix and tests for this problem:
http://cr.openjdk.java.net/~shinyafox/kulla/201503301/webrev.00/

Regards,
shinyafox(Shinya Yoshida)