Merge the initial environment script

[fan-xin]

Merge the initial environment script into the smart2

Add the sub command to smart2 to finish the environment initial.
Something like smart init [rpm-path] [rootfs-path]

User could specify the rpm-path to arbitrary directory.

[fan-xin]

Todo

• Read the related source code
• Learn how to add the command to smart
• implement the init commnad instead of using shell script
• enhance the init command including the permission check and improve the output

workload: 400 steps
period : 3 weeks