load from config, don't hardcode

dns-rest-api1.sunet.se/overlay/usr/sbin/knot_lastlogin

@@ -1,9 +1,18 @@
 #!/usr/bin/env python3
 
+import yaml
 import sqlite3
 
 try:
-    with sqlite3.connect('/var/lib/knot_rest/database.db') as conn:
+    with open('/etc/knot_rest/knot_rest.yaml') as stream:
+        yamlconf = yaml.safe_load(stream)
+except Exception as e:
+    print(e)
+
+knotrestdb = yamlconf["database"].removeprefix("sqlite:///")
+
+try:
+    with sqlite3.connect(knotrestdb) as conn:
         cur = conn.cursor()
         cur.execute('select username, description, logged_in from user')
         rows = cur.fetchall()
@@ -14,7 +23,7 @@ try:
                 description = "(no description)"
             lastlogin = row[2]
             if lastlogin == None:
-                lastlogin = "***never logged in***"
+                lastlogin = "**never logged in**"
             print(f"{username:<27}{description:<27}{lastlogin:<23}")
 except sqlite3.OperationalError as e:
     print(e)