Utilize yamllint severity levels for rule severity (#1530)

yamllint allows to categorize found problems as "error" or "warning"
ansible-lint treats them all as having VERY_LOW severity anyway
This commit keeps the VERY_LOW severity categorization for problems
that yamllint reports as "warning", but uses MEDIUM severity for
problems reported as "error"
Syntax errors reported by yamllint are raised to VERY_HIGH severity

Co-authored-by: Sorin Sbarnea <ssbarnea@redhat.com>

src/ansiblelint/rules/YamllintRule.py

@@ -83,6 +83,11 @@ def matchyaml(self, file: Lintable) -> List["MatchError"]:
             for p in run_yamllint(
                 file.content, YamllintRule.config, filepath=file.path
             ):
+                self.severity = 'VERY_LOW'
+                if p.level == "error":
+                    self.severity = 'MEDIUM'
+                if p.desc.endswith("(syntax)"):
+                    self.severity = 'VERY_HIGH'
                 matches.append(
                     self.create_matcherror(
                         message=p.desc,