RFR: JDK-8056269: get_source.sh does not copy the closed repos when cloning local filesystems

[Erik Joelsson]

Hello,

This small patch makes it possible to use get_source.sh when doing local 
clones, including closed repositories (for anyone who doesn't like the 
trees extension).

Bug: https://bugs.openjdk.java.net/browse/JDK-8056269

Webrev: http://cr.openjdk.java.net/~erikj/8056269/webrev.01/

/Erik