Log fuse mount error

[ambiknai]

Describe your changes

When there is any error while mounting bucket, logs shows only exit status. Reason for failure is not printed which makes it difficult to debug.

E0509 06:43:14.320134       1 server.go:158] GRPC error: fuseMount: cmd wait failed: <s3fs>
args: <[bha-test-m9 /var/data/kubelet/pods/3a8b6b40-df9f-487b-bd52-d43706bb2e12/volumes/kubernetes.io~csi/pvc-fd591a44-ec22-402b-9333-e0bba0b911c0/mount -o sigv2 -o use_path_request_style -o passwd_file=/var/lib/ibmc-s3fs/6ef3bbf5abef020239f77de54d8bf5f20d64d50daebfd14a64486d3da96570ff/.passwd-s3fs -o url=https://s3.direct.jp-osa.cloud-object-storage.appdomain.cloud/ -o endpoint=jp-osa-standard -o allow_other -o mp_umask=002 -o retries=5 -o kernel_cache -o upload_concurrency=30 -o low_level_retries=3 -o multipart_size=62 -o max_dirty_data=51200 -o parallel_count=8 -o max_stat_cache_size=100000 -o default_acl=private]>
error: <exit status 1>

After code change

  Warning  FailedMount  6s  kubelet  MountVolume.SetUp failed for volume "pvc-cb507f72-f113-4679-85d4-81e8cc295918" : rpc error: code = Unknown desc = fuseMount: cmd start failed: <s3fs>
args: <[bha-test-m9 /var/data/kubelet/pods/0c4c4327-ef5f-4bc8-8d8e-09bb9ef9afc6/volumes/kubernetes.io~csi/pvc-cb507f72-f113-4679-85d4-81e8cc295918/mount -o sigv2 -o use_path_request_style -o passwd_file=/var/lib/ibmc-s3fs/bf3deb8f76edabc08fd488387ba0fe24edb09ef1498deede6f3a6ae85454db27/.passwd-s3fs -o url=https://s3.direct.jp-osa.cloud-object-storage.appdomain.cloud -o endpoint=jp-osa-standard -o allow_other -o mp_umask=002 -o upload_concurrency=30 -o low_level_retries=3 -o multipart_size=62 -o max_dirty_data=51200 -o parallel_count=8 -o max_stat_cache_size=100000 -o retries=5 -o kernel_cache -o default_acl=private]>
error: <fuse: unknown option `upload_concurrency=30'
>

Issue ticket number and link

Checklist before requesting a review

• [ ] I have performed a self-review of my code
• [ ] If it is a core feature, I have added thorough tests.
• [ ] I have made sure existing UTs are not impacted
• [ ] I have executed all necessary linter and made sure internal pipeline/travis is not broken