Apollo v1.9.1 release

Bug fixes

• Remove spring dependencies from internal code #3937
• Fix issue: ingress syntax #3933

Credits

@klboke @lijiansgit

Installation

Please refer Distributed Deployment Guide

How to upgrade from v1.9.0 to v1.9.1

There is no schema change between v1.9.0 and v1.9.1
So simply deploy v1.9.1 executables with the following sequences:

1. apollo-configservice
2. apollo-adminservice
3. apollo-portal