[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

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

When the winrm communicator executes a command in an elevated shell,
this patch causes it to escape double quotes.

This is necessary as the first line in the file that it produces and
then executes it puts the command into a variable called command that
is delimited by double quotes.