name conflicts of lxcfs

[eryx]

Ⅰ. Issue Description

lxcfs is not included in the CentOS's default repository, so pouch includes of lxcfs or lxcfs.service in the pouch.rpm package. the problem is, lxcfs is a shared service, other projects (docker, rkt, ...) may also use lxcfs, so here's a question of name or paths conflicts in yum/rpm.

advice:

1. individually packaged as lxcfs-*.rpm, use the default file paths and service name of lxcfs, can share with other projects.
2. use customized file paths (/usr/pouch/*, /var/lib/pouch-lxcfs/, ...) and service name (pouch-lxcfs.service) of lxcfs, continue to be included in pouch.rpm, for pouch use only.

Ⅱ. Describe what happened

Ⅲ. Describe what you expected to happen

Ⅳ. How to reproduce it (as minimally and precisely as possible)

Ⅴ. Anything else we need to know?

Ⅵ. Environment:

• pouch version (use pouch version): 0.5.0
• OS (e.g. from /etc/os-release): CentOS 7.x
• Kernel (e.g. uname -a): 3.10.0
• Install tools: yum
• Others:

[Letty5411]

I would prefer the later one, use a new name like pouch-lxcfs.