add 'countme' stuff to web-data-analysis role

This should automate running the "countme" scripts every day to parse
new log data and publish updated totals.

Here's what I've added to the ansible role:

* install package deps for `mirrors-countme`
* make "countme" user with home /srv/countme
* clone 'prod' branch of https://pagure.io/mirrors-countme to /srv/countme
  * if changed: pip install /srv/countme/mirrors-countme
* make web subdir /var/www/html/csv-reports/countme
* make local data dir /var/lib/countme
* install `countme-update.sh` to /usr/local/bin
* install `countme-update.cron` to /etc/cron.d
  * runs /usr/local/bin/countme-update.sh daily, as user `countme`

That should make sure `countme-update.sh` runs every day.
That script works like this:

1. Run `countme-update-rawdb.sh`
  * parse new mirrors.fp.o logs in /var/log/hosts/proxy*
  * write data to /var/lib/countme/raw.db
2. Run `countme-update-totals.sh`
  * parse raw data from /var/lib/countme/raw.db
  * write updated totals to /var/lib/countme/totals.{db,csv}
3. Track changes in updated totals
  * set up /var/lib/countme as git repo (if needed)
  * commit new `totals.csv` (if changed)
4. Make updated totals public
  * Copy totals.{db,csv} to /var/www/html/csv-reports/countme

For safety's sake, I've tried to set up everything so it runs as the
`countme` user rather than running everything as `root`. This might be
an unnecessary complication but it seemed like the right thing to do.

Similarly, keeping totals.csv in a git repo isn't _required_, but it
seemed like a good idea to keep historical records in case we want/need
to change the counting algorithm or something.

I checked the YAML with ansible-lint and tested that all the scripts
work as expected when run as `wwoods`, so unless I've missed something
this should do the trick.

roles/web-data-analysis/tasks/main.yml

@@ -85,3 +85,57 @@
     - web-data
     - cron
 
+- name: install package deps for mirrors-countme
+  package:
+    # tqdm is optional but it gives nice progress meters for interactive use
+    name: ['python3-pip', 'python3-setuptools', 'python3-tqdm']
+    state: present
+  tags:
+    - packages
+    - web-data
+
+- name: make countme user
+  user:
+    name: countme
+    group: countme
+    shell: /sbin/nologin
+    home: /srv/countme
+    comment: "DNF countme counter"
+  tags:
+    - web-data
+
+- name: checkout mirrors-countme from git
+  git:
+    repo: https://pagure.io/mirrors-countme
+    dest: /srv/countme/mirrors-countme
+    version: prod
+  register: gitcountme
+  tags:
+    - web-data
+
+- name: install mirrors-countme from git checkout
+  command: "pip install --no-index --no-deps /srv/countme/mirrors-countme"
+  when: "gitcountme is changed"
+  tags:
+    - web-data
+
+- name: make countme web subdir
+  file: path=/var/www/html/csv-reports/countme state=directory mode=0775 owner=countme group=countme
+  tags:
+    - web-data
+
+- name: make countme local data dir
+  file: path=/var/lib/countme state=directory mode=0775 owner=countme group=countme
+  tags:
+    - web-data
+
+- name: install countme script to parse new logs & update totals
+  copy: src=countme-update.sh dest=/usr/local/bin/ mode=0755
+  tags:
+    - web-data
+
+- name: install cron file to run countme-update.sh daily
+  copy: src=countme-update.cron dest=/etc/cron.d/ mode=0644
+  tags:
+    - web-data
+    - cron