Run docker-containers as user instead of root.

[OzanAlpay]

Running docker containers as user instead of root feature implemented.

[bulwahn]

@OzanAlpay Did you see that Codacy is pointing out that this is not good. Can you check if it possible to write the bash expression in such a way that it works and Codacy does not complain? You need probably need to go through the bash documentation to find out which possibilities there are for quoting.

[OzanAlpay]

I will look and fix this problem soon

[OzanAlpay]

I have looked that warning again, and interestingly find-out (as codacy complained) even without any ' it works well.

I analyzed outputs after called script with different kernel-configurations and saw that it is working. Such as after calling with allyesconfig, I saw output:

scripts/kconfig/conf  --allyesconfig Kconfig

So I updated my request according to that without using any '. I will also update my other pull request( #18 ), that Codacy complained about.
By the way my home setup is:
GNU bash, version 4.3.48(1)-release (x86_64-pc-linux-gnu)
Docker version 18.03.1-ce, build 9ee9f40

[bulwahn]

This change was included into master. So, we close this pull request successfully.