Preserve the log file from a prior ocp-ansible.sh run

[viccross]

In the case of a retry, when the new Ansible run is started the old log file is removed. If someone attempts a cluster rebuild "over the top" of an existing build, the reason they attempted the prior build is lost. Let's change the process so that the log file is date/time sensitive and "rotated" when a new attempt is generated.

Possibly corollary to this should be the return of the lockout of the automation to prevent multiple or simultaneous build runs.

[viccross]

Possible implementation: the actual log file is created with a timestamp, and /var/www/html/logfile.txt is a symlink to that file. When a new attempt is started, the symlink is updated.

[viccross]

Consider also relating it to the name of the cluster, for when/if named cluster support comes along.

[viccross]

New plan: a userid created for each cluster. This userid will have all the content for that given cluster: install-config.yaml, logfile(s), links to corresponding OpenShift clients, etc.