Lack of escaping on RHEL License username/password breaks image-builder

[raykrueger]

What happened:

Building a rhel image with image-builder will break if the rhel license password contains special characters like $ or !
An image build will fail with a misleading message about a missing variable.

2023/01/24 16:48:31 Initiating Image Build
 Image OS: redhat
 Hypervisor: vsphere
2023/01/24 16:48:31 Executing command: /usr/bin/bash -c make -C /home/image-builder/eks-anywhere-build-tooling/projects/kubernetes-sigs/image-builder local-build-ova-rhel-8
make: Entering directory '/home/image-builder/eks-anywhere-build-tooling/projects/kubernetes-sigs/image-builder'
source /home/image-builder/eks-anywhere-build-tooling/build/lib/common.sh && retry git clone https://github.com/kubernetes-sigs/image-builder.git image-builder
Makefile:20: warning: undefined variable '9'

What you expected to happen:
Expected a successful build.

How to reproduce it (as minimally and precisely as possible):
Create a rhel license user with a $ in the passowrd.
Create a vsphere-connection.json with that password in place.
Build a rhel ova using image-builder

Anything else we need to know?:

Environment:

• EKS Anywhere Release:
• EKS Distro Release: