[sheepdog] [ANNOUNCE] stable sheepdog branch

[MORITA Kazutaka]

Hi all,

In the previous IRC meeting, we decided to maintain stable branches
for minor version releases like 0.6.x.  Currently, Hitoshi is willing
to take charge of it, but feel free to let us know if there is someone
who wants to manage the stable branches.

I think he will propose a plan for stable versions (release cycle,
branch name, patch management policy, and so on) later.

Thanks,

Kazutaka