[autoscaler] Replace cluster yaml validation with json schema v… (#7261)

* replace manual cluster yaml validation with json schema
- improved error message
- support for intellisense in VSCode (or other IDEs)
- run linting
- moved schema to ray/autoscaler
- fixed typo
- remove importlib dependency

* Update python/ray/autoscaler/autoscaler.py

* read

* restrict allowed properties

* added unit test for invalid yaml
added ray[test] package (remove pytest from default dependencies)

* updated autoscaler test to use ValidationError exception

* add missing dependency

* added pytest

* replace manual cluster yaml validation with json schema
- improved error message
- support for intellisense in VSCode (or other IDEs)
- run linting
- moved schema to ray/autoscaler
- fixed typo
- remove importlib dependency

* Update python/ray/autoscaler/autoscaler.py

* read

* restrict allowed properties

* added unit test for invalid yaml
added ray[test] package (remove pytest from default dependencies)

* updated autoscaler test to use ValidationError exception

* add missing dependency

* added pytest

* removed parameterized dependency
reverted ray[test] intro

* removed parameterized

* fix_tests

* format

Co-authored-by: Ubuntu <marcozo@mc-ray-jumpbox.chcbtljllnieveqhw3e4c1ducc.xx.internal.cloudapp.net>
Co-authored-by: Richard Liaw <rliaw@berkeley.edu>

python/ray/tests/test_autoscaler.py

@@ -5,6 +5,7 @@ import time
 import unittest
 import yaml
 import copy
+from jsonschema.exceptions import ValidationError
 
 import ray
 import ray.services as services
@@ -323,17 +324,17 @@ class AutoscalingTest(unittest.TestCase):
             self.fail("Test config did not pass validation test!")
 
         config["blah"] = "blah"
-        with pytest.raises(ValueError):
+        with pytest.raises(ValidationError):
             validate_config(config)
         del config["blah"]
 
         config["provider"]["blah"] = "blah"
-        with pytest.raises(ValueError):
+        with pytest.raises(ValidationError):
             validate_config(config)
         del config["provider"]["blah"]
 
         del config["provider"]
-        with pytest.raises(ValueError):
+        with pytest.raises(ValidationError):
             validate_config(config)
 
     def testValidateDefaultConfig(self):
@@ -346,7 +347,7 @@ class AutoscalingTest(unittest.TestCase):
         config = fillout_defaults(config)
         try:
             validate_config(config)
-        except Exception:
+        except ValidationError:
             self.fail("Default config did not pass validation test!")
 
     def testScaleUp(self):