Wrote ne tsts for the following packages:
- completion
- config
- download
- fix
- list
Also addressed a potential crash in the compleition, download, and list
subcommands when no arguement was provided to the Args, RunE or Run
functions.
Updated `DownloadSupportCommands`, 'ListSupportActions' function to return sorted slice of
strings.
Signed-off-by: VaibhavMalik4187 <vaibhavmalik2018@gmail.com>
