debug - speed up processing and display of file contents and services

debug - speed up processing and display of file contents and services

Use bash-internal globs and parameter expasion in preference to
assignment from output of ls or basename per file/directory.

When displaying file contents, call sed once and preprocesses the entire
file (eg pihole.toml), rather than spawning a new sed process for every
line of the file.

When checking services, call awk once to extract all data for each ip:port
pair, rather than three times.

Signed-off-by: Rob Gill <rrobgill@protonmail.com>