scripts: add option to skip docker mirror prompt
scripts: add option to skip docker mirror prompt

* From this revision, the docker image mirror prompt was removed, instead
of that, an -C option is added for pulling docker image from China mirror,
this also gives a chance to save 10 seconds for every automatically build.

* A -image <version> option is also added to specify which version docker
image to pull.

wanglei828/apollo,xiaoxq/apollo,ycool/apollo,jinghaomiao/apollo,ApolloAuto/apollo,xiaoxq/apollo,wanglei828/apollo,jinghaomiao/apollo,ycool/apollo,wanglei828/apollo,xiaoxq/apollo,ApolloAuto/apollo,xiaoxq/apollo,wanglei828/apollo,xiaoxq/apollo,jinghaomiao/apollo,ycool/apollo,wanglei828/apollo,ApolloAuto/apollo,jinghaomiao/apollo,jinghaomiao/apollo,ApolloAuto/apollo,ApolloAuto/apollo,xiaoxq/apollo,jinghaomiao/apollo,wanglei828/apollo,ycool/apollo,ycool/apollo,ycool/apollo,ApolloAuto/apollo