Add new features:
1. plugins of Ambari and k8s deploy
2. specified config 'priority_network' to solve some ip problems
Fix bugs:
fix bugs that rebalance does not work in some case.
fix count(*) from union stmt bug
fix some union stmt bugs
fix bugs when try to schema change a clone replica
* modify thirdparty/build-thirdparty.sh to fix compilation bug of thrift. (#10)
update pre-compile binaries.
* fix export LD_LIBRARY_PATH in build-thirdparty.sh
* fix export LD_LIBRARY_PATH in build-thirdparty.sh
* fix missing cluster name bug when get load job info via http.
fix compilation bugs in fe unit test
