[install] fix public key location
[install] fix public key location

key pair is created in ~/.ssh by default, ~/.ssh/id_rsa.pub
is better. This patch fixes it.

Closes-Bug: 1533481
Change-Id: I78e01fa099dea0ee790dd5a892ee40dad6341d95

AlekhyaMallina-Vedams/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals