mergify: disable automerge on backport

For now we disable the automerge on backport PR until we find a better
solution.

Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>

.mergify.yml

@@ -11,62 +11,6 @@ pull_request_rules:
         strict: smart
       dismiss_reviews: {}
       delete_head_branch: {}
-  - name: automerge backport 3.0
-    conditions:
-      - author=mergify[bot]
-      - base=stable-3.0
-      - label!=DNM
-      - status-success~=^Testing:\s(centos|ubuntu)-(non_)?container-.*
-      - status-success=continuous-integration/travis-ci/pr
-    actions:
-      merge:
-        method: rebase
-        rebase_fallback: merge
-        strict: smart
-      dismiss_reviews: {}
-      delete_head_branch: {}
-  - name: automerge backport 3.1
-    conditions:
-      - author=mergify[bot]
-      - base=stable-3.1
-      - label!=DNM
-      - status-success~=^Testing:\s(centos|ubuntu)-(non_)?container-.*
-      - status-success=continuous-integration/travis-ci/pr
-    actions:
-      merge:
-        method: rebase
-        rebase_fallback: merge
-        strict: smart
-      dismiss_reviews: {}
-      delete_head_branch: {}
-  - name: automerge backport 3.2
-    conditions:
-      - author=mergify[bot]
-      - base=stable-3.2
-      - label!=DNM
-      - status-success~=^Testing:\s(centos|ubuntu)-(non_)?container-.*
-      - status-success=continuous-integration/travis-ci/pr
-    actions:
-      merge:
-        method: rebase
-        rebase_fallback: merge
-        strict: smart
-      dismiss_reviews: {}
-      delete_head_branch: {}
-  - name: automerge backport 4.0
-    conditions:
-      - author=mergify[bot]
-      - base=stable-4.0
-      - label!=DNM
-      - status-success~=^Testing:\s(centos|ubuntu)-(non_)?container-.*
-      - status-success=continuous-integration/travis-ci/pr
-    actions:
-      merge:
-        method: rebase
-        rebase_fallback: merge
-        strict: smart
-      dismiss_reviews: {}
-      delete_head_branch: {}
 # Backports
   - actions:
       backport: