healthcheck: url_path isnt passed on to the healthcheck script

[Senthilnathan Murugappan]

With below healthcheck prop observed that the healthcheck script wasnt called with uri set. Also the sandesh resp from the agent introspect doesnt show the uri_path

service_health_check_properties: {
enabled: true,
delay: 5,
expected_codes: null,
max_retries: 5,
http_method: null,
timeout: 5,
url_path: "http://62.66.136.3/test/",
monitor_type: "HTTP"
},

2016-01-13 Wed 01:35:50:606.257 PST a2s42 [Thread 140350705886976, Pid 7597]: NetNS run command: /opt/contrail/utils/contrail_vrouter_agent_health_check.py -m HTTP -d 169.254.31.244 -t 5 -r 5 -i 5

[Prabhjot Singh Sethi (prabhjot)]

issue due to same variable name used in the scope causing url path remaining unset

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/16266
Submitter: Prabhjot Singh Sethi (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/16266
Committed: http://github.org/Juniper/contrail-controller/commit/c12c7466deb0a4230f68a4667eaab9d3011b6d56
Submitter: Zuul
Branch: master

commit c12c7466deb0a4230f68a4667eaab9d3011b6d56
Author: Prabhjot Singh Sethi <email address hidden>
Date: Mon Feb 1 16:12:02 2016 +0530

Fix Health Check HTTP url parsing

Issue:
------
usage of same variable name in local scope caused the
parsed value being destroyed with the scope, causing
url path to remain unset

Fix:
----
use http_parser to parse url provided for HTTP method,
where in case of error agent fall backs to use
http://<interface_primary_ip>/ as health check url

Closes-Bug: 1533606
Closes-Bug: 1533608
Related-Bug: 1530539
Change-Id: I60773eaef30b10008c693254de51933553b9561f