More reliable unmount w/ SIGINT, particularly on kvm2 #3985
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With kvm2, when using mount and hitting Ctrl-C, the unmount fails with:
read tcp 127.0.0.1:40862->127.0.0.1:37853: read: connection reset by peerIf you try again, it fails with:
connection is shut downThis is because the native Docker ssh implementation dies when SIGINT is encountered. This switches the implementation to use our CommandRunner over ssh, as well as adding a second attempt using "umount -f".
Additionally, I noticed that "findmnt -T /tmp/777" would show the tmpfs mount, so there is now a
grepcommand added in.