Error executing commands with space in their full path

Describe the bug

If there's a space in the full path of a command, execution via run() fails with:

[2020-08-19 13:12:48][<local>]  ERROR Error executing: /tmp/path with space/hello.
STDOUT:

STDERR:
sh: /tmp/path: No such file or directory at /home/ferki/perl5/perlbrew/perls/ferki/lib/site_perl/5.32.0/Rex/Commands/Run.pm line 326.

This kind of error may be more apparent on Windows, where calling can_run() returns the full path of the executable, which is often under C:\Program Files, which has a space in it.

Without looking into it more closely, it might be a shell quoting issue.

How to reproduce it

Steps to reproduce the behavior:

1. Create a path with space(s) in it

   mkdir -p /tmp/path\ with\ space
   

2. Create an executable under that path, e.g. named hello:

   #!/bin/bash
   echo hello
   

3. Run that command with rex: rex -e 'my $command = "/tmp/path with space/hello"; say run $command'

Shortest code example that demonstrates the bug: see above

Expected behavior

Rex should be able to execute a command even if its full path contains spaces (or possibly other special characters).

Circumstances

• Rex version: 1.12.1
• Perl version: 5.32.0
• OS running rex: Gentoo
• OS managed by rex: local/Gentoo

Debug log

Relevant excerpt is the following:

[2020-08-19 13:29:14][<local>]  DEBUG Executing eval-line
[2020-08-19 13:29:14][<local>]  DEBUG Executing: export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/usr/pkg/bin:/usr/pkg/sbin ; LC_ALL=C /tmp/path with space/hello
[2020-08-19 13:29:14][<local>]  DEBUG ========= ERR ============
[2020-08-19 13:29:14][<local>]  DEBUG sh: /tmp/path: No such file or directory

[2020-08-19 13:29:14][<local>]  DEBUG ========= ERR ============

Begin with Rex/Commands/Run.pm at line 326 and trace how run() invokes the shell. Reproduce the documented /tmp/path with space/hello command, then check the can_run() case mentioned for Windows. Done means run() executes commands whose full paths contain spaces successfully.