email fetcher properties

cmsWebApp/webroot/extensions/performa/upgrades/20190409_Email_Fetcher.txt

+Add following properties. Please confirm username and password before release. 
+Also check whether email account has third party application access. 
+run extensions/performa/testIMAP.jsp to test fetcher
+
+imap.server.name=imap.gmail.com
+imap.server.port=993
+imap.email.acc.username=
+imap.email.acc.password=
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