Back-porting JSR-356
Coyote has new dependency on Servlet API because upgrade mechanism uses Servlet[In|Out]putStream.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1514648 13f79535-47bb-0310-9956-ffa450edef68
Back-porting JSR-356
Rename SocketStatus.OPEN -> SocketStatus.OPEN_READ
Add SocketStatus.OPEN_WRITE
Required by the changes to implement non-blocking IO.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1514651 13f79535-47bb-0310-9956-ffa450edef68