8353581: Support for import module in JShell's code completion

[lahodaj]

Adding support for import module to JShell's code completion.

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Issue

• JDK-8353581: Support for import module in JShell's code completion (Bug - P4)

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[mlbridge]

Webrevs

• 00: Full (ac760898)

[asotona]

The completion is listed correctly, however it adds(or duplicates) some text to the line.
For example typing "import module java." produces:

jshell> import module java.
java.base             java.compiler         java.datatransfer     java.desktop          java.instrument       java.logging          java.management       java.management.rmi   java.naming           
java.net.http         java.prefs            java.rmi              java.scripting        java.security.jgss    java.security.sasl    java.smartcardio      java.sql              java.sql.rowset       
java.transaction.xa   java.xml              java.xml.crypto       
jshell> import module java.java.