Add role to install nfs-server, cleanup roles and configuration

- use generic media_dirs including vdr recdir, loop over them to
  create directories, configure samba, nfs, etc.
- add role to install an configure nfs-kernel-server
- cleanup roles
- add custom fact modules

library/satip_facts.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python2
+
+DOCUMENTATION = '''
+---
+module: hardware_facts
+short_description: "check if at least one SAT>IP server responds on the network"
+description:
+     - This script sends a multicast message and awaits responses by Sat>IP servers.
+       Returns the boolean variable 'satip_detected'
+'''
+EXAMPLES = '''
+- name: "detect SAT>IP Server on the network"
+  action: satip_facts
+
+- debug:
+    var: satip_detected
+'''
+
+import json
+import socket
+import sys
+import time
+
+from ansible.module_utils.basic import *
+
+SSDP_ADDR = "239.255.255.250"
+SSDP_PORT = 1900
+# SSDP_MX = max delay for server response
+# a value of 2s is recommended by the SAT>IP specification 1.2.2
+SSDP_MX = 2
+SSDP_ST = "urn:ses-com:device:SatIPServer:1"
+
+ssdpRequest = "\r\n".join((
+    "M-SEARCH * HTTP/1.1",
+    "HOST: %s:%d" % (SSDP_ADDR, SSDP_PORT),
+    "MAN: \"ssdp:discover\"",
+    "MX: %d" % (SSDP_MX),
+    "ST: %s" % (SSDP_ST),
+    "\r\n"))
+
+def main():
+    module = AnsibleModule(argument_spec={}, supports_check_mode=True,)
+    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    # according to Sat>IP Specification 1.2.2, p. 20
+    # a client should send three requests within 100 ms with a ttl of 2
+    sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 2)
+    sock.settimeout(SSDP_MX + 0.5)
+    for _ in range(3):
+        sock.sendto(ssdpRequest, (SSDP_ADDR, SSDP_PORT))
+        time.sleep(0.03)
+    try:
+        response = sock.recv(1000)
+        if response and "SERVER:" in response:
+            got_response = True
+        else:
+            raise ValueError('No satip server detected')
+    except (socket.timeout, ValueError):
+        got_response = False
+
+    module.exit_json(changed=False, ansible_facts={'satip_detected': got_response})
+
+if __name__ == '__main__':  
+    main()