disk: Allow sizes to be suffixed by a unit symbol
Merge remote-tracking branch 'origin/master'
core: remove trailing slash for modules as well

apply the same fix which has been made for commands:
007dbc6 Remove trailing slash if present when processing GANDICLI_PATH paths

Signed-off-by: William Dauchy <william@gandi.net>
Parameter size for 'gandi disk create/update' now accept suffixes.

Allow size parameter to be suffixed by a unit symbol:
M for megabytes up to T for terabytes, suffix is optional,
megabytes is the default if no suffix is present.