tape: add tape-job.cfg manual page

docs/config/tape-job/format.rst

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+Each entry starts with a header ``backup: <name>``, followed by the
+job configuration options.
+
+::
+
+  backup: job1
+	drive hh8
+	pool p4
+	store store3
+	schedule daily
+
+  backup: ...
+
+
+You can use the ``proxmox-tape backup-job`` command to manipulate
+this file.

docs/config/tape-job/man5.rst

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+==========================
+tape-job.cfg
+==========================
+
+.. include:: ../../epilog.rst
+
+-------------------------------------------------------------
+Tape Job Configuration
+-------------------------------------------------------------
+
+:Author: |AUTHOR|
+:Version: Version |VERSION|
+:Manual section: 5
+
+Description
+===========
+
+The file ``/etc/proxmox-backup/tape-job.cfg`` is a configuration file for
+Proxmox Backup Server. It contains the tape job configuration.
+
+
+File Format
+===========
+
+.. include:: format.rst
+
+
+Options
+=======
+
+.. include:: config.rst
+
+
+.. include:: ../../pbs-copyright.rst