chore: rename task files to use underscores instead of dashes to comply with...

chore: rename task files to use underscores instead of dashes to comply with Python naming conventions AND DON'T FORGET file name references in main.yml

tasks/main.yml

@@ -13,7 +13,7 @@
 
 ### GRUPPEN & BENUTZER ERSTELLEN ###
 - name: create users and groups
-  import_tasks: "create-users-groups.yml"
+  import_tasks: "create_users_groups.yml"
   tags: [users]
 
 ### SSH-KEYS VERWALTEN ###
@@ -23,12 +23,12 @@
 
 ### SFTP SERVER KONFIGURIEREN ###
 - name: Konfiguration fuer SFTP-Server einspielen
-  import_tasks: "configure-sftp-server.yml"
+  import_tasks: "configure_sftp_server.yml"
   tags: [sftp]
 
 ### IPTABLES REGELN SETZEN ###
 - name: iptables-Regeln für externe Produzenten setzen
-  import_tasks: "configure-iptables-externalusers.yml"
+  import_tasks: "configure_iptables_externalusers.yml"
   tags: [iptables]
 
 - name: install IBM Spectrum Protect (IBMSP) Backup Client