Un-manage should not fail when any one or few storage nodes are down

[GowthamShanmugam]

bugzilla: 1645221 tendrl-bug-id: Tendrl/commons#1078

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

[GowthamShanmugam]

@shtripat @nthomas-redhat please review

[codecov[bot]]

Codecov Report

Merging #1079 into master will decrease coverage by 0.94%. The diff coverage is 35.89%.

@@            Coverage Diff             @@
##           master    #1079      +/-   ##
==========================================
- Coverage   80.81%   79.86%   -0.95%     
==========================================
  Files          91       92       +1     
  Lines        3826     3894      +68     
  Branches      502      515      +13     
==========================================
+ Hits         3092     3110      +18     
- Misses        631      677      +46     
- Partials      103      107       +4

Impacted Files	Coverage Δ
tendrl/commons/flows/unmanage_cluster/__init__.py	86.36% <ø> (ø)	:arrow_up:
...mmons/objects/node/flows/stop_services/__init__.py	75.86% <ø> (ø)	:arrow_up:
...ts/cluster/atoms/set_cluster_unmanaged/__init__.py	100% <100%> (ø)	:arrow_up:
tendrl/commons/objects/cluster/__init__.py	100% <100%> (ø)	:arrow_up:
...r_peer/atoms/gluster_server_peer_check/__init__.py	27.27% <27.27%> (ø)
...s/cluster/atoms/delete_cluster_details/__init__.py	76.19% <42.85%> (-9.53%)	:arrow_down:
...luster/atoms/stop_integration_services/__init__.py	77.04% <44.44%> (-6.88%)	:arrow_down:
...cluster/atoms/stop_monitoring_services/__init__.py	77.04% <44.44%> (-6.88%)	:arrow_down:

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[GowthamShanmugam]

@shtripat please review

[GowthamShanmugam]

@shtripat changes are done