Issue 6312 - In branch 2.5, healthcheck report an invalid warning reg…

…arding BDB deprecation

Bug description:
	during healthcheck, _lint_backend_implementation checks that
	the instance is not running a BDB backend.
	This check only applies for instance after 3.0.0

Fix description:
	If the instance is newer than 3.0.0 the health check
	just returns

relates: 389ds#6312

Reviewed by:

dirsrvtests/tests/suites/healthcheck/healthcheck_test.py

@@ -529,6 +529,7 @@ def create_dummy_db_files(inst, backend_type):
             f.write('')  # Create an empty file for simplicity
 
 
+@pytest.mark.skipif(ds_is_older("3.0.0"), reason="mdb and bdb are both supported")
 def test_lint_backend_implementation_wrong_files(topology_st):
     """Test the lint for backend implementation wrong files
 

src/lib389/lib389/backend.py

@@ -14,7 +14,7 @@
 from lib389.properties import BACKEND_OBJECTCLASS_VALUE, BACKEND_PROPNAME_TO_ATTRNAME, BACKEND_CHAIN_BIND_DN, \
                               BACKEND_CHAIN_BIND_PW, BACKEND_CHAIN_URLS, BACKEND_PROPNAME_TO_ATTRNAME, BACKEND_NAME, \
                               BACKEND_SUFFIX, BACKEND_SAMPLE_ENTRIES, TASK_WAIT
-from lib389.utils import normalizeDN, ensure_str, assert_c
+from lib389.utils import normalizeDN, ensure_str, assert_c, ds_is_newer
 from lib389 import Entry
 
 # Need to fix this ....
@@ -513,7 +513,7 @@ def _lint_mappingtree(self):
 
     def _lint_backend_implementation(self):
         backend_impl = self._instance.get_db_lib()
-        if backend_impl == 'bdb':
+        if backend_impl == 'bdb' and ds_is_newer('3.0.0', instance=self._instance):
             result = DSBLE0006
             result['items'] = [self.lint_uid()]
             yield result