Fix missing SASL and other dependencies for OpenSUSE 15 builds

[patrick-stephens]

Problem

OpenSUSE 15 builds are missing dependencies for SASL and other features, leading to incomplete functionality.

Background

From PR #3: "SUSE 15 dependencies missing for SASL, etc." - while the basic OpenSUSE 15 build works, it's missing several key dependencies that affect functionality.

Current Status

• ✅ Basic OpenSUSE 15 build infrastructure is in place
• ❌ SASL support is not properly configured
• ❌ Other missing dependencies need identification and resolution

Tasks

• Audit OpenSUSE 15 Dockerfile for missing dependencies
• Identify packages needed for SASL support
• Test and validate that SASL functionality works after fixes
• Compare feature set with other distributions to ensure parity
• Update custom/packaging/distros/suse/Dockerfile with missing packages
• Ensure verify-config.sh passes for required features like FLB_HAVE_KAFKA_SASL

Acceptance Criteria

• verify-config.sh passes for all required features on SUSE 15 builds
• SASL authentication works properly
• Feature parity with Debian/UBI builds where applicable
• Documentation updated if any features remain unavailable

Related

• PR: feat: add OpenSuse builds and fix up container builds #3 - feat: add OpenSuse builds and fix up container builds
• Existing SUSE 15 implementation in custom/packaging/distros/suse/Dockerfile
• testing/verify-config.sh validation requirements

[patrick-stephens]

Fixed in #100