15a9adc053
Automatic merge from submit-queue (batch tested with PRs 65830, 65780, 65961). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
vSphere: set vCenter client UserAgent
**What this PR does / why we need it**:
Setting the client UserAgent makes it easier to identify vCenter sessions
used by the vSphere Cloud Provider. This is useful to remove sessions that
have leaked, such as when a VCP process goes away without calling Logout().
And to test that VCP properly re-authenticates when a session is removed.
Example use:
``` console
% govc session.ls | grep kubernetes-cloudprovider | awk '{print $1}' | xargs -n1 govc session.rm
```
**Special notes for your reviewer**:
Prior to the change, the session UserAgent is listed as `Go-http-client/1.1`, with the change as `kubernetes-cloudprovider/v1.12.0-...`
Format based on the azure provider client User-Agent: ac99da5e3e/pkg/cloudprovider/providers/azure/azure.go (L386-L393)
``` console
% govc session.ls
Key Name Time Idle Host Agent
5217bfbf-ed78-3538-c4f4-137dfdc87d97 VSPHERE.LOCAL\Administrator 2018-07-09 05:26 3m32s 10.0.0.237 kubernetes-cloudprovider/v1.12.0-alpha.0.1990+ac99da5e3e0c0d-dirty
52259ed5-417e-dab4-07bc-f1b01c06f6ce VSPHERE.LOCAL\vpxd-extension-09179ffe-ed51-4dee-91a6-c60162932acd 2018-07-09 05:25 4m41s 10.0.0.208 cl/1.0.0
5225b5d4-1c0a-e8e4-887e-5fa46fee0dc2 VSPHERE.LOCAL\vpxd-extension-09179ffe-ed51-4dee-91a6-c60162932acd 2018-05-26 16:25 old 127.0.0.1 VMware vim-java 1.0
52385c6f-31b5-876e-3e44-35dc7120fe55 VSPHERE.LOCAL\vpxd-extension-09179ffe-ed51-4dee-91a6-c60162932acd 2018-05-26 16:26 old 127.0.0.1 VMware vim-java 1.0
524b23c3-52b3-2fb8-00d4-914f1b34e9b1 VSPHERE.LOCAL\vpxd-extension-09179ffe-ed51-4dee-91a6-c60162932acd 2018-05-26 16:25 old 127.0.0.1 VMware vim-java 1.0
524b6a02-0590-0c1b-db95-0d67b2c36875 VSPHERE.LOCAL\vpxd-extension-09179ffe-ed51-4dee-91a6-c60162932acd 2018-05-26 16:26 1m26s 127.0.0.1 VMware vim-java 1.0
528b6f73-a658-f488-2651-05f3ec182757 VSPHERE.LOCAL\Administrator 2018-07-09 05:28 55s 10.0.0.237 Go-http-client/1.1
52987a71-c671-09e4-6613-ff480aa43882 VSPHERE.LOCAL\vpxd-extension-09179ffe-ed51-4dee-91a6-c60162932acd 2018-05-26 16:25 old 127.0.0.1 VMware vim-java 1.0
52aa9262-a0c7-a79f-7983-2d3858ecc562 VSPHERE.LOCAL\Administrator 2018-07-09 05:09 . 10.0.0.154 govc/0.18.0
52b270fe-2e84-6209-04ff-f4597846ca79 VSPHERE.LOCAL\vpxd-extension-09179ffe-ed51-4dee-91a6-c60162932acd 2018-05-26 16:26 old 127.0.0.1 VMware vim-java 1.0
52d7e734-80a9-0887-e6cb-13a92c1e4e30 VSPHERE.LOCAL\vpxd-extension-09179ffe-ed51-4dee-91a6-c60162932acd 2018-05-26 16:25 old 127.0.0.1 VMware vim-java 1.0
52f5365e-6945-44c6-dc3c-0e3c90444bb0 VSPHERE.LOCAL\vpxd-extension-09179ffe-ed51-4dee-91a6-c60162932acd 2018-05-26 16:26 old 127.0.0.1 VMware vim-java 1.0
52f58503-4943-e4c7-1d90-a3ec7d16ba71 VSPHERE.LOCAL\vpxd-extension-09179ffe-ed51-4dee-91a6-c60162932acd 2018-05-26 16:26 old 127.0.0.1 VMware vim-java 1.0
52fd2f13-d1a9-7ff9-b779-c87b1e4e0490 VSPHERE.LOCAL\vpxd-extension-09179ffe-ed51-4dee-91a6-c60162932acd 2018-05-26 16:30 6m46s 10.0.0.208 VMware vim-java 1.0
```
**Release note**:
```release-note
NONE
```
Kubernetes
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