added an option for https introspect

[tnaganawa]

change to ignore ssl certificate error, when https introspect is used.

• https://github.com/tungstenfabric/tf-specs/blob/master/5.1/tls_support.md#33-introspect-service

 - w/o this option

[root@ip-172-31-15-94 ~]# python3 ist.py ctr status
Failed to reach destination
URL: http://127.0.0.1:8083/Snh_SandeshUVECacheReq?tname=NodeStatus
Reason:  ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response',))

[root@ip-172-31-15-94 ~]# python2 ist.py ctr status
Failed to reach destination
URL: http://127.0.0.1:8083/Snh_SandeshUVECacheReq?tname=NodeStatus
('Reason: ', ConnectionError(ProtocolError('Connection aborted.', BadStatusLine("''",)),))
[root@ip-172-31-15-94 ~]#


- w/ this option

[root@ip-172-31-15-94 ~]# python3 ist.py --ssl-enable ctr status
/usr/local/lib/python3.6/site-packages/urllib3/connectionpool.py:988: InsecureRequestWarning: Unverified HTTPS request is being made to host '127.0.0.1'. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecureRequestWarning,
module_id: contrail-control
state: Functional
description
+-----------+-----------+---------------------+--------+----------------------------------+
| type      | name      | server_addrs        | status | description                      |
+-----------+-----------+---------------------+--------+----------------------------------+
| Collector | n/a       |   172.31.15.94:8086 | Up     | Established                      |
| Database  | Cassandra |   172.31.15.94:9041 | Up     | Established Cassandra connection |
| Database  | RabbitMQ  |   172.31.15.94:5673 | Up     | RabbitMQ connection established  |
+-----------+-----------+---------------------+--------+----------------------------------+
[root@ip-172-31-15-94 ~]# 
[root@ip-172-31-15-94 ~]# 
[root@ip-172-31-15-94 ~]# 
[root@ip-172-31-15-94 ~]# python ist.py --ssl-enable ctr status
/usr/lib/python2.7/site-packages/urllib3/connectionpool.py:847: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecureRequestWarning)
module_id: contrail-control
state: Functional
description
+-----------+-----------+---------------------+--------+----------------------------------+
| type      | name      | server_addrs        | status | description                      |
+-----------+-----------+---------------------+--------+----------------------------------+
| Collector | n/a       |   172.31.15.94:8086 | Up     | Established                      |
| Database  | Cassandra |   172.31.15.94:9041 | Up     | Established Cassandra connection |
| Database  | RabbitMQ  |   172.31.15.94:5673 | Up     | RabbitMQ connection established  |
+-----------+-----------+---------------------+--------+----------------------------------+
[root@ip-172-31-15-94 ~]#