Changes to BAP session storage.

[SEERM #7294]
[Bug #40937817]

* exploit/multi/handler no longer filtered out from vuln creation and
other steps
* Name changed to parent module's name in session storage so we show something more helpful
than generic handler
* Same for vuln and attempt creation
Merge pull request #1179 from rapid7/bug/bap-compro-hosts

Changes to BAP session storage