Show commit and version numbers

[WeiZhang555]

Print git commit hash id when run runv -v, this will be helpful for debug.

Signed-off-by: Zhang Wei zhangwei555@huawei.com

Examples:

$ ./runv -v
runv version 0.7.0, commit: v0.7.0-145-g23cbab6-dirty

Means version: 0.7.0, latest tag is v0.7.0, we are 145 commits forward from that tag, current git commit is 23cbab6, dirty means we have uncommited changes in repo when building the binary.

[WeiZhang555]

Another fix is, after changing the Makefile, runv is statically built binary now, before this, it's still dynamic binary.

Oh no, libvirt-dev doesn't have static library, so revert to dynamicallly built binary

[WeiZhang555]

@gao-feng You're right, update now.

[gao-feng]

LGTM, thanks!