Replace links to bugs.bareos.org in code

[arogge]

$ git grep bugs.bareos.org
README.md:  * [https://bugs.bareos.org](https://bugs.bareos.org)
core/manpages/bareos.8:See <https://bugs.bareos.org>
core/platforms/win32/mingw-debugsrc-devel.spec:# Please submit bugfixes or comments via http://bugs.bareos.org
core/src/vmware/README.md:[http://bugs.bareos.org](http://bugs.bareos.org)
devtools/pip-tools/changelog_utils/update_links.py:                ] = "https://bugs.bareos.org/view.php?id={}".format(m.group("issuenum"))
devtools/update-changelog-links.sh:# * issue numbers   -> link to bugs.bareos.org
devtools/update-changelog-links.sh:      printf "[%s]: https://bugs.bareos.org/view.php?id=%d\n" \
docs/manuals/source/DeveloperGuide/generaldevel.rst:We had an historical bug database located at https://bugs.bareos.org/\ , which is now
docs/manuals/source/DocumentationStyleGuide/BareosSpecificFormatting/Links.rst:bugs.bareos.org
docs/manuals/source/DocumentationStyleGuide/BareosSpecificFormatting/Links.rst:If you want to reference an issue that is tracked on https://bugs.bareos.org/, the following formatting should be used:
docs/manuals/source/IntroductionAndTutorial/WhatIsBareos.rst:| Bug tracker             | https://bugs.bareos.org/                                                                                                                                      |
docs/manuals/source/_extensions/bareos-ext.py:        "mantis", autolink("https://bugs.bareos.org/view.php?id={}", "Issue #{}")
docs/manuals/source/conf.py:# issues_uri = 'https://bugs.bareos.org/view.php?id={issue}'
systemtests/tests/python-bareos/test_list_command.py:        # Before fixing https://bugs.bareos.org/view.php?id=1007 the keys could be scrambled after 100 entries.
webui/module/Application/view/layout/layout.phtml.in:                  <li><a href="https://bugs.bareos.org/" target="_blank"><?php echo $this->translate("Bugtracker"); ?></a></li>

Also use the opportunity to update links in README.md

[joergsteffens]

This is covered by #1808.