feat: Add support for downgrading package(s) on host

Signed-off-by: Rushikesh Jadhav <rushikesh7@gmail.com>

Author: rushikeshjadhav

lib/host.py

@@ -482,6 +482,10 @@ def get_last_yum_history_tid(self):
         except ValueError:
             raise Exception('Unable to parse correctly last yum history tid. Output:\n' + history_str)
 
+    def yum_downgrade(self, packages):
+        logging.info('Downgrade packages: %s on host %s' % (' '.join(packages), self))
+        return self.ssh(['yum', 'downgrade', '-y'] + packages)
+
     def yum_install(self, packages, enablerepo=None):
         logging.info('Install packages: %s on host %s' % (' '.join(packages), self))
         enablerepo_cmd = ['--enablerepo=%s' % enablerepo] if enablerepo is not None else []