Remove unused jobs

Change-Id: I2eadbf61435789ccd9a60778def1081d007a62ba
diff --git a/zuul.yaml b/zuul.yaml
index 2db7a78..32993eb 100644
--- a/zuul.yaml
+++ b/zuul.yaml
@@ -44,53 +44,6 @@
     vars:
       perform_extra_work: true
 
-- job:
-    name: f29-gcc-cover
-    description: |
-      Build on Fedora 29 with GCC and code coverage.
-    parent: f29-gcc
-    post-run: playbooks/coverage-diff/upload-one-report.yaml
-    provides: coverage-f29-gcc-new
-    vars:
-      coverage_xml_dir: "{{ ansible_user_dir }}/build"
-
-- job:
-    name: f29-gcc-cover-previous
-    description: |
-      Build previous version of sources on Fedora 29 with GCC and code coverage.
-    parent: f29-gcc-cover
-    pre-run: playbooks/coverage-diff/checkout-previous.yaml
-    provides: coverage-f29-gcc-old
-    voting: false
-    vars:
-      coverage_xml_dir: "{{ ansible_user_dir }}/build"
-
-- job:
-    name: cpp-coverage-diff
-    description: |
-      Report how coverage changed compared to the previous state of the repo.
-    nodeset:
-      nodes:
-        - name: w
-          label: f29
-    timeout: 120
-    pre-run: playbooks/coverage-diff/prepare.yaml
-    run: playbooks/coverage-diff/generate.yaml
-    post-run: playbooks/coverage-diff/upload-diff.yaml
-    success-url: coverage-diff.html
-    failure-url: coverage-diff.html
-    requires:
-      - coverage-f29-gcc-old
-      - coverage-f29-gcc-new
-    dependencies:
-      - f29-gcc-cover
-      - f29-gcc-cover-previous
-    vars:
-      previous_source_prefix: "{{ ansible_user_dir }}/previous-src"
-      coverage_xml_dir: "{{ zuul.project.src_dir }}/cover"
-      coverage_job_name_previous: f29-gcc-cover-previous
-      coverage_job_name_current: f29-gcc-cover
-
 # TODO: this should be renamed and replace cpp-coverage-diff once we no longer have Fedora 29
 - job:
     name: f31-cpp-coverage-diff