Support of different default pass schemes + support of BLF-CRYPT (#3832)

* Introduce MAILCOW_PASS_SCHEME in order to support blowfish (cf. mailcow/mailcow-dockerized#1019)

* Furthermore added dovecot to support new environment varible for MAILCOW_PASS_SCHEME defaulted to SSHA256

* Revert changes regarding gitignore.

* Added fallback to SSHA256 if environment is not proper prepared.

* No fallback within management frontend, as it must match to other components.

* Unified and corrected alignment; implemented support of SSHA512

* Currently, password_hash of PHP is using by default bcrypt (BLF). As this might change later, we must ensure, that BLF is still used after PHP changes its default.

* Switched to BLF-CRYPT by default (even on update)

* Switched to BLF-CRYPT by default (even on update)

* Adding information in config generation / update with link to supported hash algorithm

* Bump sogo version to 1.92

* Fallback to BLF-CRYPT in case password scheme is not proper defined for Mailcow administration.

generate_config.sh

@@ -117,6 +117,11 @@ cat << EOF > mailcow.conf
 
 MAILCOW_HOSTNAME=${MAILCOW_HOSTNAME}
 
+# Password hash algorithm
+# Only certain password hash algorithm are supported. For a fully list of supported schemes,
+# see https://mailcow.github.io/mailcow-dockerized-docs/model-passwd/
+MAILCOW_PASS_SCHEME=BLF-CRYPT
+
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 # SQL database configuration
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