tests: Drop pytest-split-tests in favor of pytest-split

The plugin pytest-split-tests is used to split the tests in several
groups so that the tests can be executed in parallel is upstream CI.

The issue is thet pytest-split-tests last release was more that a
year ago, upstream developers have not been responsive, and there is
a bug when the number of tests to be executed by a group is zero.
The patch to fix this issue has been open for a year.

This patch deprecates the use of pytest-split-tests, changing the
plugin used to split the tests to pytest-split, which is actively
mainatined.

requirements-tests.txt

 -r requirements.txt
 pytest>=2.7
 pytest-sourceorder>=0.5
-pytest-split-tests>=1.0.3
+pytest-split>=0.8.0
 pytest-testinfra>=5.0
 pyyaml>=3

tests/azure/templates/galaxy_script.yml

@@ -60,9 +60,8 @@ jobs:
         -m "playbook" \
         --verbose \
         --color=yes \
-        --test-group-count=${{ parameters.number_of_groups }} \
-        --test-group=${{ parameters.group_number }} \
-        --test-group-random-seed=97943259814 \
+        --splits=${{ parameters.number_of_groups }} \
+        --group=${{ parameters.group_number }} \
         --junit-xml=TEST-results-group-${{ parameters.group_number }}.xml
     displayName: Run playbook tests
     env:

tests/azure/templates/playbook_tests.yml

@@ -61,9 +61,8 @@ jobs:
         -m "playbook" \
         --verbose \
         --color=yes \
-        --test-group-count=${{ parameters.number_of_groups }} \
-        --test-group=${{ parameters.group_number }} \
-        --test-group-random-seed=97943259814 \
+        --splits=${{ parameters.number_of_groups }} \
+        --group=${{ parameters.group_number }} \
         --junit-xml=TEST-results-group-${{ parameters.group_number }}.xml
     displayName: Run playbook tests
     env: