Only run 'ee' target (i.e. build.py) if makefile is out of date. In the pro
build the 2nd call to ee spends ~20 seconds making a makefile, which has
nothing to do.
Remove voltcache and voltkv pgks from build.xml
Remove tests of voltcache and voltkv packages.  They are no longer built.
Based on Paul's comments, split ee: into 2 parts, building the makfile
(the slow stuff) and calling the makefile.  Now, if you ctrl-c, you can
restart and make will still get called.
Merge remote branch 'origin/master' into build-speedup
Removed an extra copy in ee_buildmakfile
Merge pull request #481 from VoltDB/build-speedup

Build changes