* Add setting to disable authorized_keys backup when rewriting public keys

Signed-off-by: Magnus Lindvall <magnus@dnmgns.com>

* Update default value to comply with documentation

Signed-off-by: Magnus Lindvall <magnus@dnmgns.com>

* Use tmp-file instead of bak-file for saving manually added keys.

Signed-off-by: Magnus Lindvall <magnus@dnmgns.com>

* Change casing

Signed-off-by: Magnus Lindvall <magnus@dnmgns.com>

* Change casing and build bakpath with sprintf only

Signed-off-by: Magnus Lindvall <magnus@dnmgns.com>

* Only close file once

Signed-off-by: Magnus Lindvall <magnus@dnmgns.com>

* Do not modify calcFingerprint

Signed-off-by: Magnus Lindvall <magnus@dnmgns.com>

* Fix casing

Signed-off-by: Magnus Lindvall <magnus@dnmgns.com>

* Change style from disable to enable

Signed-off-by: Magnus Lindvall <magnus@dnmgns.com>

* Change name, just SSH_BACKUP_AUTHORIZED_KEYS

Signed-off-by: Magnus Lindvall <magnus@dnmgns.com>

* Do not check for directory existence if backup is disabled

Signed-off-by: Magnus Lindvall <magnus@dnmgns.com>