[network-manager-pptp] (12 commits) ...service: merge branch 'th/logging-bgo771664'

[Thomas Haller <thaller src gnome org>]

Summary of changes:

  706fd54... shared: update shared files
  78bfc42... service: add missing error handling when parsing command li
  d45f5a4... service: namespace global variables in a struct "gl"
  ef3a51f... service: replace g_log() by new logging macros
  5bc8184... build: reorder src/Makefile.am
  5c653e1... service: make valid_properties array const
  3d6cb1b... service: allow setting log_level via environment variable N
  d3bcc38... service: configure logging level of pptp via NM_VPN_LOG_LEV
  3520b40... src: namespace global variable proxy in pppd-plugin
  1263f52... src: use logging macros in pppd-plugin and make logging con
  cb9a073... service: use syslog() for logging from pppd-plugin
  c6aaa03... service: merge branch 'th/logging-bgo771664'