Add 'sles' using the "OS_OPENSUSE" tag

[neotinker]

With the release of SLES 15 SP3, OpenSUSE and SUSE Linux Enterprise Server now share a common code base and are 100% binary compatible.Since the work has already been done to support OpenSUSE, lets just treat SLES as if it is OpenSUSE to reduce duplicated effort.

https://www.suse.com/c/introducing-suse-linux-enterprise-15-sp3/#:~:text=With%20the%20release%20of%20SLES,again%20%E2%80%93%20with%20assured%20application%20compatibility.

neotinker@ros-sles153:~/devel> cat /etc/os-release 
NAME="SLES"
VERSION="15-SP3"
VERSION_ID="15.3"
PRETTY_NAME="SUSE Linux Enterprise Server 15 SP3"
ID="sles"
ID_LIKE="suse"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:suse:sles:15:sp3"
DOCUMENTATION_URL="https://documentation.suse.com/"
neotinker@ros-sles153:~/devel> 

[cottsay]

Actually, I'd rather see us add a new OS ID for SLES and then perform an alias in rosdep like we do for Ubuntu and RHEL derivatives. Better to give more specific information here.

[cottsay]

Friendly ping. If you're not interested in pushing this forward, we should close this PR.

[neotinker]

Honestly, since I opened this PR, the direction of SLES has become less clear. It is probably best not to mix the two.

[cottsay]

Honestly, since I opened this PR, the direction of SLES has become less clear. It is probably best not to mix the two.

All the more reason to add a new OS ID here. We can decide whether to "alias" the distro in rosdep, but this is the first step regardless of whether SLES is an alias of OpenSUSE or not.