URL Config option source

[char0n]

After we receive config options from remote URL we are merging it in the following way:

 mergedOptions = mergeOptions({}, systemOptions, mergedOptions, urlOptions, queryOptions)

Given that the order of config options source precedence is:

1. query options
2. url options
3. user options
4. system options

...we should probably merge it in the following way:

mergedOptions = mergeOptions({}, defaultOptions, systemOptions, userOptions, urlOptions, queryOptions)

Reasoning

In the original mergedOptions the systemOptions are fully overridden by defaultOptions which are part of mergeOptions. We don't want to do that. We want systemOptiosn, urlOptions and queryOptions to kick in.

[char0n]

Addressed by #9831