MSP-11605
The `framework` from 'Msf::Simple::Framework' shared context is not
guaranteed to make threads with `framework.threads` anymore, so the
cleaner shouldn't allows be present in 'Msf::Simple::Framework'.
MSP-11147
Extract from 'Msf::Simple::Framework' the `after(:each)` that kills and joins
threads from `framework.threads` into 'Msf::Framework#threads cleaner`.
[#46491831]
Move Msf::DBManager#import_msf_xml into
Msf::DBManager::ImportMsfXml#import_msf_xml and include
Msf::DBManager::ImportMsfXml to cut down size of the infamous db.rb.
Break up #import_msf_xml to have separate methods for parsing web_forms,
web_pages, and web_vulns. The method for
web_vulns, #import_msf_web_vuln_element is needed so that it can be overridden in
Pro to handle the Pro-only changes to Mdm::WebVuln.
Luke Imhoff