ci(gitlab-ci): enable instance after upstream issue resolved [skip ci]

* Automated using https://github.com/myii/ssf-formula/pull/342

.gitlab-ci.yml

@@ -149,9 +149,9 @@ ubuntu-1804-master-py3: {extends: '.test_instance'}
 # default-centos-8-master-py3: {extends: '.test_instance'}
 # passenger-centos-8-master-py3: {extends: '.test_instance'}
 centos-8-master-py3: {extends: '.test_instance'}
-default-centos-7-master-py3: {extends: '.test_instance'}
+# default-centos-7-master-py3: {extends: '.test_instance'}
 # passenger-centos-7-master-py3: {extends: '.test_instance'}
-# centos-7-master-py3: {extends: '.test_instance'}
+centos-7-master-py3: {extends: '.test_instance'}
 default-fedora-34-master-py3: {extends: '.test_instance'}
 # fedora-34-master-py3: {extends: '.test_instance'}
 default-fedora-33-master-py3: {extends: '.test_instance'}

.travis.yml

@@ -109,9 +109,9 @@ jobs:
     # - env: INSTANCE=default-centos-8-master-py3
     # - env: INSTANCE=passenger-centos-8-master-py3
     - env: INSTANCE=centos-8-master-py3
-    - env: INSTANCE=default-centos-7-master-py3
+    # - env: INSTANCE=default-centos-7-master-py3
     # - env: INSTANCE=passenger-centos-7-master-py3
-    # - env: INSTANCE=centos-7-master-py3
+    - env: INSTANCE=centos-7-master-py3
     - env: INSTANCE=default-fedora-34-master-py3
     # - env: INSTANCE=fedora-34-master-py3
     - env: INSTANCE=default-fedora-33-master-py3