Change in vdsm[master]: [WIP]change startup process for vdsm and supervdsm

Royce Lv has posted comments on this change.

Change subject: [WIP]change startup process for vdsm and supervdsm
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Patch Set 1:

Thanks a lot,Dan, for reviewing this patch, this is just a prototype,but I really
appreciate your opinion about in which way this should be done so post it with bugs and
dirty codes:)
 
The motivation of this patch is we expect vdsm and supervdsm can crash independently,let
something like respawn/vdsmService to take care their authorised communication, We indeed
considered to start supervdsm and then let it to fork vdsm, but we don't want svdsm
server be mixed up with startup process, more over,we expect super vdsm crash will not
result in restarting vdsm.It has been accomplished at this point.

Reason for rewriting respawn in python is we'd like start up and restart process
convenient to debug, But I agree with you, let systemd or upstart to take care of it is
better.

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Gerrit-MessageType: comment
Gerrit-Change-Id: I69aae6b0b9529c80291d90c6ad14ff82b21aea53
Gerrit-PatchSet: 1
Gerrit-Project: vdsm
Gerrit-Branch: master
Gerrit-Owner: Royce Lv <lvroyce(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Adam Litke <agl(a)us.ibm.com&gt;
Gerrit-Reviewer: Dan Kenigsberg <danken(a)redhat.com&gt;
Gerrit-Reviewer: Mark Wu <wudxw(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Royce Lv <lvroyce(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Shu Ming <shuming(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;