injecting network configuration adaptively for various type of linux partition layout

The deficient of the current way of injecting network configuration to VM are:
1. the configuration file is always injected to the first partition. It will be injected wrongly if one use native ubuntu livecd installation, the file will go to /boot
2. it is unable to recognize the layout of the partitions, such as Linux partition and Linux LVM.

A new way of injecting network configuration is proposed in this blueprint.
The new features are as follows:
1. checking the partition layout of a VM image using "fdisk", if "linux LVM member" is found, the corresponding volume groups will be mounted.
2. a strategy will be adopted to search the folder's pattern(such as /etc), to make sure the configuration is injected correctly.
3. a strategy will be adopted to search the content layout, such that various kinds of linux distributions will be recognized and injecting distribution-specificated configuration file for them.