junit support for gradle

Added junit support for gradle
gradle build will run minimal test cases and runs in 4 minutes
gradle jar will not run any test case
gradle junit will run all junit and takes about 30 minutes
Merge pull request #185 from arunthirupathi/gradleJunit

junit support for gradle, Will Merge in this commit and will apply the patch on the top from Szczepan.
Adding debug log messages for CoordinatorService
Adding debug log messages for CoordinatorService - adding review comments
fix problems in admin tool

1. fix bug in validating store names on nodes
2. rename some functions
3. use node id rather than node object in admin command functions
Releasing Voldemort 1.8.3
bdb native backup fixups