Sharing BOSH context should not prevent context restart.

introduces changes that relate to sharing the web context on which BOSH is running with other components (such as plugin-provided components).

Adding handlers through the newly introduced {{addJettyHandler}} in HttpBindManager, causes a problem to occur when the manager is restarted:

 
The above exception is triggered (but not caused) by a change to the keystore, making use of functionality introduced in OF-1373.