Support writing back to token files from openconnect(8) itself
Support writing back to token files from openconnect(8) itself

This is quite basic; we probably ought to re-read the file and call
openconnect_set_token_mode() again if it's changed, and we ought to
have locking on the file to prevent concurrent updates. But this is a
good start.

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

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