Make python3 default in Dockerfile

[sectoramen]

Context

Although python3 was installed. the /usr/bin directory still had a symlink to python2. Fixed by removing the symlink and creating a new one that points to python3. Verified with

[host] Prowler % docker run --rm -it --entrypoint /bin/bash prowler:latest
[prowler@302c9cbd6e18 prowler]$ ls -al /usr/bin/pytho*
lrwxrwxrwx 1 root root 16 Feb 14 19:19 /usr/bin/python -> /usr/bin/python3
lrwxrwxrwx 1 root root 9 Feb 7 22:13 /usr/bin/python2 -> python2.7
-rwxr-xr-x 1 root root 7048 Jun 10 2021 /usr/bin/python2.7
lrwxrwxrwx 1 root root 9 Feb 14 19:19 /usr/bin/python3 -> python3.7
-rwxr-xr-x 2 root root 7048 Jun 3 2021 /usr/bin/python3.7
-rwxr-xr-x 2 root root 7048 Jun 3 2021 /usr/bin/python3.7m
[prowler@302c9cbd6e18 prowler]$

Description

Removed symlink /usr/bin/python -> /usr/bin/python2 and created stymlink /usr/bin/python -> /usr/bin/python3

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[toniblyx]

LGTM

[toniblyx]

Thanks @sectoramen