provision_civicrm.inc: function _provision_civicrm_is_site_context(): remove the  argument, which isn't used anymore.
provision_civicrm.inc: _provision_civicrm_get_package_path(): fix  variable name.
migrate: use the strict=false option, to avoid a BOA 2.3 bug when migrating sites (this should probably use a Provision service).