Replace "email" ZEDLETs with "notify" ZEDLETs

Several ZEDLETs already exist for sending email in reponse to a
particular zevent.  While email is ubiquitous, alternative methods may
be better suited for some configurations.  Instead of duplicating the
"email" ZEDLETs for every future notification method, it is preferable
to abstract the notification method into a function.  This has the
added benefit of reducing the amount of code duplicated between
ZEDLETs, and allowing related bugs to be fixed in a single location.

This commit replaces the existing "email" ZEDLETs with corresponding
"notify" ZEDLETs.  In addition, the ZEDLET code for sending an
email message has been moved into the zed_notify_email() function.
And this zed_notify_email() has been added to a generic zed_notify()
function for sending notifications via all available methods that
have been configured.

This commit also changes a couple of related zed.rc variables.
ZED_EMAIL_INTERVAL_SECS is changed to ZED_NOTIFY_INTERVAL_SECS,
and ZED_EMAIL_VERBOSE is changed to ZED_NOTIFY_VERBOSE.  Note that
ZED_EMAIL remains unchanged as its use is solely for the email
notification method.

Signed-off-by: Chris Dunlap <[email protected]>

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