gerrit-name -> $ZUUL_PROJECT in macro use-zuul

Modify the `use-zuul` defaults to use $ZUUL_PROJECT instead of our
variable `gerrit-name`.  There is no need to hardcode the project name
since Zuul already pass it when triggering jobs.

See also bug 53470.

Jobs updated:

analytics-asana-stats-pep8
analytics-asana-stats-pyflakes
analytics-check-stats-pep8
analytics-check-stats-pyflakes
analytics-editor-geocoding-pep8
analytics-editor-geocoding-pyflakes
analytics-gerrit-stats-pep8
analytics-gerrit-stats-pyflakes
analytics-glass-pep8
analytics-glass-pyflakes
analytics-reportcard-pep8
analytics-reportcard-pyflakes
integration-docroot-phplint
integration-jenkins-pep8
integration-jenkins-pyflakes
integration-jjb-config-yamllint
integration-zuul-config-yamllint
integration-zuul-layoutdiff
integration-zuul-layoutvalidation
labs-incubator-phplint
labs-nagios-builder-pep8
labs-nagios-builder-pyflakes
labs-tools-grrrit-yamllint
mediawiki-vagrant-puppet-validate
mw-skins-erudite-phplint
mw-skins-mediawiki-strapping-phplint
mw-skins-webplatform-phplint
mw-tools-codeutils-pep8
mw-tools-codeutils-phplint
mw-tools-dippybird-phplint
mw-tools-fluoride-pep8
mw-tools-fluoride-pyflakes
mw-tools-release-pep8
mw-tools-release-phplint
mw-tools-release-pyflakes
mwext-MobileFrontend-ruby1.9.3lint
mwext-PoolCounter-build
mwext-UniversalLanguageSelector-ruby1.9.3lint
mwext-timeline-perllint
operations-apache-config-lint
operations-debs-adminbot-pep8
operations-debs-adminbot-pyflakes
operations-debs-ircecho-pep8
operations-debs-ircecho-pyflakes
operations-dumps-pep8
operations-mw-config-phplint
operations-mw-config-tests
operations-puppet-cdh4-erblint-HEAD
operations-puppet-cdh4-pplint-HEAD
operations-puppet-doc
operations-puppet-erblint-HEAD
operations-puppet-jmxtrans-erblint-HEAD
operations-puppet-jmxtrans-pplint-HEAD
operations-puppet-kafka-erblint-HEAD
operations-puppet-kafka-pplint-HEAD
operations-puppet-pep8
operations-puppet-test
operations-puppet-typos
operations-puppet-validate
operations-puppet-zookeeper-erblint-HEAD
operations-puppet-zookeeper-pplint-HEAD
operations-software-pep8
operations-software-redactatron-pep8
php-FastStringSearch-build
php-NativePreprocessor-build
php-luasandbox-build
php-wikidiff-build
php-wikidiff2-build
php-wmerrors-build
pywikibot-compat-pep8
pywikibot-compat-pyflakes
pywikibot-core-pep8
pywikibot-core-pyflakes
pywikibot-i18n-pep8
pywikibot-i18n-pyflakes
qa-browsertests-ruby1.9.3lint
qa-browsertests-yamllint
sartoris-pep8
sartoris-pyflakes
translatewiki-phplint
translatewiki-puppet-validate
translatewiki-shelllint
translatewiki-yamllint
wikimedia-bugzilla-wikibugs-perllint
wikimedia-fundraising-tools-pep8
wikimedia-fundraising-tools-pyflakes
wikimedia-fundraising-tools-yamllint

bug: 53470
Change-Id: I703abcfffb6e205546f6c9593b766c6f11134b5b