ipvsadm '--exact' arg to ensure outputs are ints

Currently the keepalivedlvs_query script calls ipvsadm -Ln --stats
to query the local lvs for connection information. If any of these
values grow large enough they will be abbreviated with human-
friendly suffixes (K, M, G) and cause the get_ipvsadm_info func
to raise an exception when it receives a non-integer value from
its command output. By using the --exact argument in addition to
the existing arguments, we can ensure the output is always expanded
numbers, per the ipvsadm man page, and will only ever offer integer
outputs to the get_ipvsadm_info command.

Change-Id: I2e8c0be2221c0c23b752fdf2cdff065cddf830a5
Story: 2006791
Task: 37331

octavia/amphorae/backends/utils/keepalivedlvs_query.py

@@ -280,8 +280,9 @@ def get_udp_listener_pool_status(listener_id):
 
 def get_ipvsadm_info(ns_name, is_stats_cmd=False):
     cmd_list = ['ip', 'netns', 'exec', ns_name, 'ipvsadm', '-Ln']
+    # use --exact to ensure output is integer only
     if is_stats_cmd:
-        cmd_list.append('--stats')
+        cmd_list += ['--stats', '--exact']
     output = subprocess.check_output(cmd_list, stderr=subprocess.STDOUT)
     if isinstance(output, bytes):
         output = output.decode('utf-8')