Remove unused code

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1560645 13f79535-47bb-0310-9956-ffa450edef68
Use try with resoucres

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1560646 13f79535-47bb-0310-9956-ffa450edef68
Clean-up
 - Container will always be a Context
 - only need one call to Thread.currentThread().getContextClassLoader()
 - Fix logic hole if loader.getClassLoader() returns null
 - Formatting to make code easier to read

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1560651 13f79535-47bb-0310-9956-ffa450edef68
Code clean-up
 - BackupManager is an instance of ClusterManagerBase
 - StandardManager is an instance of ManagerBase

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1560652 13f79535-47bb-0310-9956-ffa450edef68
Add bind()/unbind() to Context

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1560653 13f79535-47bb-0310-9956-ffa450edef68
Migrate AsyncContext to use Context bind()/unbind()

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1560654 13f79535-47bb-0310-9956-ffa450edef68
Add new message

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1560655 13f79535-47bb-0310-9956-ffa450edef68
Migrate StandardHostValve to use Context bind/unbind

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1560656 13f79535-47bb-0310-9956-ffa450edef68
More migrations to Context bind()/unbind()

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1560659 13f79535-47bb-0310-9956-ffa450edef68
Migrate to Context bind()/unbind()

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1560660 13f79535-47bb-0310-9956-ffa450edef68