fixed a bug about auto-adding primary key in insert sql
replace ConcurrentLinkedQueue to LinkedBlockingQueue in MyCATSequnceProcessor, also add a single thread Executor in it, instead of wild thread.
Merge branch 'master' of https://github.com/runfriends/Mycat-Server
Merge branch 'master' of https://github.com/runfriends/Mycat-Server
resolve conflict in RouterUtil.java from MyCATApache  https://github.com/MyCATApache/Mycat-Server.git
Merge branch 'master' of https://github.com/runfriends/Mycat-Server
resolve conflict in RouterUtil.java from MyCATApache  https://github.com/MyCATApache/Mycat-Server.git
Merge https://github.com/runfriends/Mycat-Server
Merge pull request #43 from runfriends/master

fixed a bug and optimized in MyCATSequenceProcessor