Add a parameter to disable configuration file automatic creation

[superdarki]

Changes

• This should add the possibility to disable automatic creation of the configuration files by the daemon
• Closes Support glob for configuration files panel#608 (comment) (as explained in the discussion, adding a flag instead of glob support might be better)

Why

In very specific cases, configuration files should not be created by the daemon before the server first startup as they have not been created during the installation process.
This new flag enables egg creators to specify (default true) if the file should be created or not when the daemon tries to parse it.

What it add

(This is just an example on the Vanilla Minecraft egg, this is not where I think the flag would be useful)

How

When the daemon tries to open the file to parse it, changing the function to Open instead of Touch makes it return an error instead of creating the file. If the error is "IsNotExist" and "create_file" is false just return without logging an error.

Config parser file open function edition :

Add the flag to the ConfigurationFile struct :

UnmarshalJSON function addition :

[superdarki]

I have a bug with my pelican install (docker related), I can't test if the IsNotExist error handling works.

[superdarki]

Tested it and now it works, the error handling and the not creation of the file

[dshygfujsfgy]

UP

[gOOvER]

UP

??

[QuintenQVD0]

This now conflicts with this: #34

and is there anyone realy needing this?