Connections are not properly released causing them to stick in the "CLOSE_WAIT" state and cause "Too many files open"

It appears that org.apache.axis2.transport.http.SOAPOverHTTPSender does not properly cleanup the http post connection after payload has been sent.

The symptoms of this problem show up in `netstat` as literally hundreds of connections in the "CLOSE_WAIT" state. On a busy server this can cause the application to report exceptions with the message "Too many open files."

I looked in the source code for axis2 1.0 and discovered that in SOAPOverHTTPSender.java the releaseConnection() is never called on the postMethod variable. This seems to be a likely candidate for the source of the issue.

See SOAPOverHTTPSender.java:97-118