fix conflict logical in properties config.

support setting app id from OS environment variable APP_ID

Add OpenAPI to get application information

modified spring security user update and delete sql by use primary key  for support database set SQL_SAFE_UPDATES = 1 #1997 (#2016)

* bugfix: line feed under Windows. resolve issue #2015

feature: diff configurations among clusters. issue #1966

优化网卡地址优先级，index低的网卡地址优先级高

* replace some guava API with new Java 1.7 native API
* replace Collections.sort with List.sort(Java 1.7)
* replace annonymous inner types with lambdas
* use try-with-resources where possible
* replace explicit types with diamond operators

fix bug (when use reverse proxy with TLS, "HttpServletResponse.sendRedirect" will redirect to http rather than https)

fix bug (when use reverse proxy with TLS, "HttpServletResponse.sendRedirect" will redirect to http rather than https)

1. fix flyway migration Chinese garbled issue
2. limit hibernate query plan cache
3. fix import/export api
4. wording update for yaml/yml namespace support
5. update ldap sample configurations

enhance ldap user service to support filtering users by group

修复service-apollo-portal-server.yaml initContainers The Deployment "deployment-apollo-portal-server" is invalid:问题

add yaml support to apollo-client

1. support yaml config file transform to properties
2. support yaml config file injection to Spring

add rate limter for no app id warning log

add servlet initializer for apollo-portal and apollo-adminservice