[TACHYON-8][TACHYON-194] Move some MasterConf and CommonConf usages to use TachyonConf

This PR contains changes to push instance of TachyonConf to some of the components such as Master and Worker to replace usages of CommonConf and MasterConf.

The PR passes all unit tests so it is a good indication how the rest of code will change to use TachyonConf instance instead of static calls to xxxConf.get().

This PR should give sample on how to use TachyonConf to process the properties configuration.
Don't think we need this logic here. The only entry points that users are allowed to use right now are TFS, TachyonFS, TachyonMaster.main (testing) and TachyonWorker.main (testing). This client is used at those times, so those 4 should be the only parts that need the null check