Work around a bug in cAdvisor on ppc64le by removing \0 from SystemUUID

[jlpadilla]

Original PR: #94

Description of changes

Remove trailing null character from SystemUUID.

See google/cadvisor#2811 for the original bug.

A trailing null character in a Go string (_systemUUID) is confusing Redis on the hub:

# oc logs -n open-cluster-management search-prod-d2cf2-search-aggregator-8695c876b4-wfmvp
...
I0222 08:39:39.698067       1 resyncCluster.go:29] Resync for cluster: ocp-dal12-53e5 edges to insert: 2633
E0222 08:39:39.841503       1 redisinterfacev2.go:46] Error fetching results from RedisGraph V2 : errMsg: Invalid input at end of input: expected ' line: 1, column: 353, offset: 352 errCtx: ...des', kind:'node', created:'2021-02-09T21:53:14Z', _systemUUID:'IBM,0678B8300 errCtxOffset: 80
E0222 08:39:39.843059       1 redisinterfacev2.go:46] Error fetching results from RedisGraph V2 : errMsg: Invalid input at end of input: expected ' line: 1, column: 556, offset: 555 errCtx: ..., kind:'node', _clusterNamespace:'ocp-dal12-53e5', _systemUUID:'IBM,0678B8300 errCtxOffset: 80
E0222 08:39:39.844247       1 redisinterfacev2.go:46] Error fetching results from RedisGraph V2 : errMsg: Invalid input at end of input: expected ' line: 1, column: 193, offset: 192 errCtx: ..., apiversion:'v1', created:'2021-02-09T21:53:14Z', _systemUUID:'IBM,0678B8300 errCtxOffset: 80
W0222 08:39:39.844272       1 insert.go:36] Rejecting Resource ocp-dal12-53e5/03043655-7d3e-4510-baec-f237efde1661: errMsg: Invalid input at end of input: expected ' line: 1, column: 193, offset: 192 errCtx: ..., apiversion:'v1', created:'2021-02-09T21:53:14Z', _systemUUID:'IBM,0678B8300 errCtxOffset: 80

On the spoke:

I0211 12:26:46.698846       1 sender.go:229] First time sending or last Sync cycle failed, sending complete payload
I0211 12:26:46.747321       1 sender.go:176] Sending Resources { request: 683963, add: 4250, update: 0, delete: 0 edge add: 2625 edge delete: 0 }
E0211 12:27:28.193966       1 sender.go:233] Sync sender error. Aggregator reported wrong number of total intra edges. Expected 2625, got 2323
E0211 12:27:28.193987       1 sender.go:285] SEND ERROR: Aggregator reported wrong number of total intra edges. Expected 2625, got 2323
W0211 12:27:28.193996       1 sender.go:299] Backing off send interval because of error response from aggregator. Sleeping for 10s

A pull request has been submitted to cAdvisor to remove this trailing null character from the string.
However, in the meantime, we would like to work around this issue in the search-collector so we can support older versions of kubelet that do not have the fix.
The proposed patch has been tested on ppc64le and solves the issue mentioned above.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication

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This pull-request has been approved by: jlpadilla, xrajesh
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