ensure gnutls is initialized before use
ensure gnutls is initialized before use

Section 7.1.2 of the gnutls info manual states that it must be
initialized with a call to gnutls_global_init before use. This
fixes the syslog warning I was seeing:

  lxc-create: Libgcrypt warning: missing initialization -
              please fix the application

Signed-off-by: Dwight Engen <1793d65cf7b9eefb2bb8f5bee9a4b8ba782c26da@oracle.com>
Acked-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

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