Removed all inline javascript focus code, general function to protect all password fields including tooltip

Prevent password managers to overwrite passwords in reseller / client and mailbox edit screen (fixes #4030)

First part of fix for issue #3896 - Unknown column 'default_mailserver' in 'field list' when saving client limits main template

client addition page.

- added limit for letsencrypt and directive snippets selector to client limits
- hide ssl tab if letsencrypt is selected