nmcli gets NM version and compares it with its own and complains
when they differ. This is to indicate that the results are not reliable,
because the API could differ. '--nocheck' switches the checks off.
If SSID is a UTF-8 string, it is printed as it is, but enclosed in quotes.
Otherwise the bytes are converted to hex string (in uppercase).
The added quotes for UTF-8 string allow to disambiguate the two forms.
Modifications are mainly for multiline mode to ease parsing - each
field name is prefixed with a section name.
'dev list' now also supports printing particular sections specifed via
'--fields' option.
The output is basically tabular with fields (columns) presenting specific pieces of info.
Each line represents a single object. It's possible to switch to multiline output using
'--multiline' option. In that mode single object is presented on more lines - each field
on its line.
Terse mode now uses ':' as field separator. It also escapes all occurences of ':' and '\'
inside field values to ease parsing. The escaping behaviour can be controlled through
'--escape' option. By default, escaping is switched on in tabular mode. When using terse
mode ('--terse'), '--fields' option is mandatory for specifying required fields. That helps
for flexibility and backwards compatibility.
Not all output is converted yet.
