Hot restart scheme

[kaero]

In addition to hardRestart and softRestart we have a proposition for hotRestart scheme:

1. up full pool of the new workers;
2. if previous step is done, then disconnect and shutdown old pool.

[kaero]

\cc @golyshevd

[golyshevd]

looks right =)

[golyshevd]

ping? Any news?

[kaero]

@golyshevd sad, but nothing new is here. Is it critical feature for you?

[golyshevd]

Not critical, but we waiting for =)
Looked at recluster, it can that, but not interesting in recluster, want luster =)