[haproxy] Obfuscate the stats auth

Example of the line that needed to be obfuscated

```
listen stats
    bind 127.0.0.1:8888
    mode http
    stats enable
    stats hide-version
    stats realm Haproxy\ Statistics
    stats uri /
    stats auth admin:AQoZ0cvVsXdVfMOYuOfWS7BEr4aVe42e
```

Also use f-strings on the rest of the plugin.

Signed-off-by: Arif Ali <arif-ali@ubuntu.com>

Author: arif-ali

sos/report/plugins/haproxy.py

@@ -31,7 +31,7 @@ class HAProxy(Plugin, RedHatPlugin, DebianPlugin):
     def setup(self):
         self.add_copy_spec([
             "/etc/haproxy/haproxy.cfg",
-            self.var_puppet_gen + "/etc/haproxy/haproxy.cfg"
+            f"{self.var_puppet_gen}/etc/haproxy/haproxy.cfg"
         ])
         self.add_copy_spec("/etc/haproxy/conf.d/*")
         self.add_cmd_output("haproxy -f /etc/haproxy/haproxy.cfg -c")
@@ -63,10 +63,20 @@ def setup(self):
             return
 
         # check if provision_ip contains port - if not, add default ":1993"
-        if urlparse("http://"+provision_ip).port is None:
+        if urlparse(f"http://{provision_ip}").port is None:
             provision_ip = provision_ip + ":1993"
 
-        self.add_cmd_output("curl http://"+provision_ip+r"/\;csv",
+        self.add_cmd_output(fr"curl http://{provision_ip}/\;csv",
                             suggest_filename="haproxy_overview.txt")
 
+    def postproc(self):
+        self.do_path_regex_sub(
+            "/etc/haproxy/",
+            r"(stats auth \w+:)(.*)",
+            r"\1*********")
+        self.do_path_regex_sub(
+            f"{self.var_puppet_gen}/etc/haproxy/",
+            r"(stats auth \w+:)(.*)",
+            r"\1*********")
+
 # vim: set et ts=4 sw=4 :