zenpop3.py does not delete email messages

[zenoss]

1) Processed emails not deleted because .quit() method not called. The .delete() method only flags messages for deletions, .quit makes it happen, see http://goodythoughts.blogspot.com/2008_01_01_archive.html

2) --nodelete flag causes crash cause deleters not initilized. Move line 104 'deleters = []' up two lines before the 'if' statement to fix.

[zenoss]

Patch to allow deleting messages

[cluther]

(In [10376]) * Refs #3737: Fix zenpop3 so it will properly reconnect and finish.

• Refs #3249: Make zenpop3 delete emails if the nodelete flag is not used.

[cluther]

(In [10380]) * Fixes #3249: Make zenpop3 delete emails if the nodelete flag is not used.