Make buf_append_bytes() NUL-terminate the buffer storage
Make buf_append_bytes() NUL-terminate the buffer storage

We rely on being able to use these as strings

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

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