Improve MockHttpServletRequest's compatibility with Servlet 3.1 [SPR-11492]

[spring-projects-issues]

Andy Wilkinson opened SPR-11492 and commented

Servlet 3.1 added methods that can be supported by MockHttpServletRequest without having a compile dependency on the 3.1 API:

• long getContentLengthLong() on javax.servlet.ServletRequest
• String changeSessionId() on javax.servlet.HttpServletRequest

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Affects: 4.0 GA