WIP: dovecot 2.4 support

modoboa_installer/scripts/files/dovecot/2.4/conf.d/90-quota.conf

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+##
+## Quota configuration.
+##
+
+# Note that you also have to enable quota plugin in mail_plugins setting.
+## <https://doc.dovecot.org/latest/core/plugins/quota.html>
+
+##
+## Quota limits
+##
+
+# Quota limits are set using "quota_rule" parameters. To get per-user quota
+# limits, you can set/override them by returning "quota_rule" extra field
+# from userdb. It's also possible to give mailbox-specific limits, for example
+# to give additional 100 MB when saving to Trash:
+
+#mail_plugins {
+#  quota = yes
+#}
+
+quota "User quota" {
+#   storage_size = 1G
+}
+#
+#namespace inbox {
+#   mailbox Trash {
+#     quota_storage_extra = 100M
+#   }
+#}
+
+##
+## Quota warnings
+##
+
+# You can execute a given command when user exceeds a specified quota limit.
+# Each quota root has separate limits. Only the command for the first
+# exceeded limit is excecuted, so put the highest limit first.
+# The commands are executed via script service by connecting to the named
+# UNIX socket (quota-warning below).
+# Note that % needs to be escaped as %%, otherwise "% " expands to empty.
+
+#quota "User quota" {
+#  warning warn-95 {
+#    quota_storage_percentage = 95
+#    execute quota-warning {
+#      args = 95 %{user}
+#    }
+#  }
+#  warning warn-80 {
+#    quota_storage_percentage = 80
+#    execute quota-warning {
+#      args = 80 %{user}
+#    }
+#  }
+#}
+
+# Example quota-warning service. The unix listener's permissions should be
+# set in a way that mail processes can connect to it. Below example assumes
+# that mail processes run as vmail user. If you use mode=0666, all system users
+# can generate quota warnings to anyone.
+#service quota-warning {
+#  executable = script /usr/local/bin/quota-warning.sh
+#  user = dovecot
+#  unix_listener quota-warning {
+#    user = vmail
+#  }
+#}
+
+##
+## Quota backends
+##
+
+# Multiple backends are supported:
+#   count: Default and recommended, quota driver tracks the quota internally within Dovecot's index files.
+#   maildir: Maildir++ quota
+#   fs: Read-only support for filesystem quota
+#quota "User quota" {
+#  driver = count
+#}