Old links present in installation guide

[Manpreet Kaur]

This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes:

- [x] This doc is inaccurate in this way: The installation guide refers to old github links in order to install python-tackerclient.
- [ ] This is a doc addition request.
- [ ] I have a fix to the document that I can paste below including example: input and output.

If you have a troubleshooting or support issue, use the following resources:

 - The mailing list: https://lists.openstack.org
 - IRC: 'openstack' channel on Freenode

-----------------------------------
Release: 1.4.1.dev2 on 2018-03-08 23:03:28
SHA: bbe6d2c7e0348aa6afb7200f0ab6416016305ab4
Source: https://opendev.org/openstack/python-tackerclient/src/doc/source/install/index.rst
URL: https://docs.openstack.org/python-tackerclient/latest/install/index.html

[Manpreet Kaur (manpreetk)]

Submitted patch for reported issue,
https://review.opendev.org/c/openstack/python-tackerclient/+/774427

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/python-tackerclient 1.6.0 release.