Clean up GnuTLS load_certificate() and improve comments
Clean up GnuTLS load_certificate() and improve comments

Signed-off-by: David Woodhouse <b460d66aaf00c296a3db1c1d9eeafc081d5f7d70@intel.com>

chadcatlett/openconnect,atyndall/openconnect,nmav/openconnect-mine,brandt/openconnect,nmav/openconnect-mine,chadcatlett/openconnect,lins05/openconnect,neshema/openconnect,brandt/openconnect,don-johnny/openconnect,don-johnny/openconnect,lins05/openconnect,don-johnny/openconnect,mveplus/openconnect-client,mtmiller/openconnect,liiir1985/openconnect,matlockx/openconnect,neshema/openconnect,neshema/openconnect,mveplus/openconnect-client,cernekee/openconnect,mtmiller/openconnect,certik/openconnect,lins05/openconnect,nmav/openconnect-mine,don-johnny/openconnect,matlockx/openconnect,cernekee/openconnect,matlockx/openconnect,lins05/openconnect,liiir1985/openconnect,cernekee/openconnect,atyndall/openconnect,mtmiller/openconnect,atyndall/openconnect,mveplus/openconnect-client,atyndall/openconnect,brandt/openconnect,brandt/openconnect,nmav/openconnect-mine,certik/openconnect,chadcatlett/openconnect,liiir1985/openconnect,mtmiller/openconnect,cernekee/openconnect,mveplus/openconnect-client,sihde/openconnect,sihde/openconnect,chadcatlett/openconnect,sihde/openconnect,matlockx/openconnect,liiir1985/openconnect,neshema/openconnect,certik/openconnect