Use context manager for mssql and postgresql modules. (#65224)

lib/ansible/modules/database/mssql/mssql_db.py

@@ -122,8 +122,7 @@ def db_delete(conn, cursor, db):
 
 def db_import(conn, cursor, module, db, target):
     if os.path.isfile(target):
-        backup = open(target, 'r')
-        try:
+        with open(target, 'r') as backup:
             sqlQuery = "USE [%s]\n" % db
             for line in backup:
                 if line is None:
@@ -135,8 +134,6 @@ def db_import(conn, cursor, module, db, target):
                     sqlQuery += line
             cursor.execute(sqlQuery)
             conn.commit()
-        finally:
-            backup.close()
         return 0, "import successful", ""
     else:
         return 1, "cannot find target file", "cannot find target file"

lib/ansible/modules/database/postgresql/postgresql_pg_hba.py

@@ -285,7 +285,7 @@ class PgHba(object):
         self.comment = []
         # read the pg_hbafile
         try:
-            file = open(self.pg_hba_file, 'r')
+            with open(self.pg_hba_file, 'r') as file:
                 for line in file:
                     line = line.strip()
                     # uncomment
@@ -296,7 +296,6 @@ class PgHba(object):
                         self.add_rule(PgHbaRule(line=line))
                     except PgHbaRuleError:
                         pass
-            file.close()
             self.unchanged()
         except IOError:
             pass