Add Cmdline import command

[HebaruSan]

Background

#2177 created the ability to import manually downloaded files to the cache, as part of ConsoleUI.

#2246 added it for GUI.

Changes

This pull request adds the same import functionality for Cmdline.

$ ckan import --help
CKAN 1.24.0-PRE2+d6a802f8a78c
Copyright © 2014-2017
 
import - Import manually downloaded mods
Usage: ckan import [options] paths

  --ksp              KSP install to use

  --kspdir           KSP dir to use

  -v, --verbose      (Default: False) Show more of what's going on when 
                     running.

  -d, --debug        (Default: False) Show debugging level messages. Implies 
                     verbose

  --debugger         (Default: False) Launch debugger at start

  --net-useragent    Set the default user-agent string for HTTP requests

  --headless         (Default: False) Set to disable all prompts

  --asroot           (Default: False) Allows CKAN to run as root on Linux-based
                     systems

You are using CKAN version v1.24.0-PRE2+d6a802f8a78c

$ ckan import /tmp/B8CF009D-Astrogator-v0.7.8.zip 

Importing B8CF009D-Astrogator-v0.7.8.zip... (0%)Importing Astrogator v0.7.8...
Install 1 compatible imported mods? [Y/n] 
Import complete. Delete 1 old files? [Y/n] 
About to install...

 * Astrogator v0.7.8 (cached)
 * Module Manager 3.0.1 (cached)
 * LoadingTipsPlus V1.5 (cached)

Continue? [Y/n]

If you specify a directory, it'll attempt to import all files in it.

The core function NetModuleCache.Store is also updated to populate a default cache filename of CkanModule.StandardName(), to make them consistent with normally downloaded filenames.

[politas]

Are we sure we want the --headless default to be delete the old file? Also, can we include the ksp installation name or location in the "Install [x] compatible mods" prompt?

[HebaruSan]

Added the instance name and path to the Y/n prompt.
I'll need to think about the headless question. I had assumed that was mainly for Jenkins scripts.

[HebaruSan]

OK, now we don't prompt for deletion in headless mode.

> ckan import c:\users\user\appdata\local\temp\ckan\09DA68AB-Astrogator-v0.7.8.zip --headless

Importing 09DA68AB-Astrogator-v0.7.8.zip... (0%)Importing Astrogator v0.7.8...
About to install...

 * Astrogator v0.7.8 (cached)
 * Module Manager 3.0.1 (cached)
 * LoadingTipsPlus V1.5 (cached)


Installing mod "Astrogator v0.7.8"
Installing mod "ModuleManager 3.0.1"
Installing mod "LoadingTipsPlus V1.5"
Updating registry
Commiting filesystem changes
Rescanning GameData
Done!