[PATCH] tools: hv: lsvmbus: change shebang to use python3

[Anthony Nandaa <profnandaa@gmail.com>]

This patch updates the shebang in the lsvmbus tool to use python3
instead of python. The change is necessary because Python 2 has
reached its end of life as of January 1, 2020, and is no longer
maintained[1]. Many modern systems do not have python pointing to
Python 2, and instead use python3.

By explicitly using python3, we ensure compatibility with modern
systems since Python 2 is no longer being shipped by default.

This change also updates the file permissions to make the script
executable, so that the script runs out of the box.
Also, similar scripts within `tools/hv` have mode `755`:

```
-rwxr-xr-x 1 labuser labuser   930 Jun 28 16:15 hv_get_dhcp_info.sh
-rwxr-xr-x 1 labuser labuser   622 Jun 28 16:15 hv_get_dns_info.sh
-rwxr-xr-x 1 labuser labuser  1888 Jun 28 16:15 hv_set_ifconfig.sh
```

Before fix, this is what you get when you attempt to run `lsvmbus`:
```
/usr/bin/env: ‘python’: No such file or directory
```

[1] https://www.python.org/doc/sunset-python-2/

Signed-off-by: Anthony Nandaa <profnandaa@gmail.com>
---
 tools/hv/lsvmbus | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 mode change 100644 => 100755 tools/hv/lsvmbus

diff --git a/tools/hv/lsvmbus b/tools/hv/lsvmbus
old mode 100644
new mode 100755
index 55e7374bade0..23dcd8e705be
--- a/tools/hv/lsvmbus
+++ b/tools/hv/lsvmbus
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # SPDX-License-Identifier: GPL-2.0
 
 import os
-- 
2.33.8