Add optional param to prefix the extension ini filename

[spacepants]

Hey there,

So when loading extensions, sometimes it's desirable to specify the extension load order — for example loading opcache before other modules. This adds support for prefixing the extension ini filename to accomplish this.

[poikilotherm]

The patch seems very reasonable to me.

Seems to be the resolution to #272.

Please merge this ASAP - this resolves the issue of "duplicate" ini files on RHEL as they have such prefixes. (This leads to warnings about reloading of extensions, which is absolutely not necessary and prone to cause even worse errors.)

[jk2l]

how will this fix the duplicate issue? let say if the default installed 10-module.ini and you want to raise the load order to 20-module.ini, the issue same with other similar pull request it will not delete the 10-module.ini caused duplicate ini file.

[poikilotherm]

@jk2l, you are right. At least, you don't get duplicated files with default names like "10-module.ini" and "module.ini". Instead, the default file will get edited and options are added.

Maybe @spacepants could extend his code to use a tidy resource to cleanup any unmanaged files for the extensions now under puppet control?