Raising node down alert only for managed nodes

[GowthamShanmugam]

tendrl-bug-id: Tendrl/commons#1002 bugzilla: 1580385

Signed-off-by: GowthamShanmugasundaram gshanmug@redhat.com

[GowthamShanmugam]

Handled a corner case here, all nodes are down and some nodes are ready to expand then current logic won't consider all nodes are down and it won't raise a brick alert. Here I modified logic like all managed nodes are down and any unmanaged node status is up, in this case also I am raising all brick are down and volume down.

if i am not checked unmanaged node then if we stop and down the unmanaged nodes before cluster import also node down alert will be raised.

[GowthamShanmugam]

verified

[GowthamShanmugam]

@r0h4n @shtripat @nthomas-redhat please review

[GowthamShanmugam]

I verified @shtripat but I this is a very corner case so it not strike in my mind at last build.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@6b0ded2). Click here to learn what that means. The diff coverage is 0%.

@@            Coverage Diff            @@
##             master    #1003   +/-   ##
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  Coverage          ?   64.86%           
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  Files             ?       90           
  Lines             ?     3626           
  Branches          ?      455           
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  Hits              ?     2352           
  Misses            ?     1213           
  Partials          ?       61

Impacted Files	Coverage Δ
tendrl/commons/objects/node_context/__init__.py	40.97% <0%> (ø)

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