Ignoring SSHKeyBadOwner if user is root (uid 0)

core: Scrub SSH PTY output to filter out command echo-ing and most other cruft

[GH-4403]

Use -f argument to rm to force-remove files.

When using pty=true, removing files using sudo may request confirmation,
which will hang the connection.

Similarly, sometimes assumptions about file existence may be wrong and
in those cases it seems better to continue on as long as the file does
not exist, so -f makes sense there, too.

typofixes - https://github.com/vlajos/misspell_fixer

Allows using `sudo vagrant up` without `chown`ing the insecure private key

fix should_upload_file, write to stdout before exit 1

providers/hyper-v: fixes import for hyper-v generation 2 VMs

providers/docker: Clean docker containers when calling vagrant docker-run

Fixes 4309: Error when provisioning Windows host using Puppet