New hotspot project repos

[Paul Hohensee]

Some may have noticed new Hotspot repos on hg.openjdk.java.net.  We've
made the Hotspot project independent of any particular JDK project 
because Hotspot
delivers into multiple JDKs.  These new repos replace the ones under the 
jdk7
project for Hotspot development going forward.  They are

hsx/hotspot-main

This is the Hotspot integration repo and replaces jdk7/hotspot.

hsx/hotspot-gc
hsx/hotspot-rt
hsx/hotspot-comp

These are the Hotspot group repos and replace jdk7/hotspotgc, 
jdk7/hotspot-rt
and jdk7/hotspot-comp.

We've also changed when we create repos for specific Hotspot versions.  
For update
releases, we used to do it just before delivery into b01 of the update.  
Now, we'll
do it when we bump the version number.  The version-specific repos will 
be used
as flow-through repos during promotion into various JDK master hotspot 
repos,
so when development on a version is done the corresponding 
version-specific repo
will contain the definitive source for that version.  The current 
Hotspot version repo
for hs22 was created just yesterday and is

hsx/hsx22

Paul