Sketch for the modular alert system
Implement an interface to gather alerts from external modules

Ticket:	#3855
Add alert module for HTTP SSL certificate
Alert module to check for HTTPD bind address
Alert module for iSCSI portal IP bind
Alert module for for multipath status
Alert module for volume status
Do not raise exception but log as error
Use new alert framework to show entries
Send email for critical alerts
Change tools.alert to use the new alert module
Do not limit alert in a time range
Catch up alert detail view with new API