[BUG] Kustomizer makes Microshift to crash if manifest is not validated

[oglok]

What happened:

Adding a set of buggy manifests to /var/lib/microshift/manifests/ and its kustomization.yaml provokes Microshift to crash.

What you expected to happen:

If a manifests has any error, don't apply it, but microshift should keep up and running.

How to reproduce it (as minimally and precisely as possible):

1. Create a kustomization.yaml with one resource (i.e. pod.yaml)
2. Pod.yaml must be buggy, and oc apply -f pod.yaml should not work.

Anything else we need to know?:

Environment:

• Microshift Version: 4.7.0-0.microshift-2021-08-10-163759
• Hardware configuration: Libvirt VM 2GB/2vCPUs
• OS (e.g: cat /etc/os-release):
• cat /etc/os-release
  NAME="Red Hat Enterprise Linux"
  VERSION="8.4 (Ootpa)"
  ID="rhel"
  ID_LIKE="fedora"
  VERSION_ID="8.4"
  PLATFORM_ID="platform:el8"
  PRETTY_NAME="Red Hat Enterprise Linux 8.4 (Ootpa)"
  ANSI_COLOR="0;31"
  CPE_NAME="cpe:/o:redhat:enterprise_linux:8.4:GA"
  HOME_URL="https://www.redhat.com/"
  DOCUMENTATION_URL="https://access.redhat.com/documentation/red_hat_enterprise_linux/8/"
  BUG_REPORT_URL="https://bugzilla.redhat.com/"

REDHAT_BUGZILLA_PRODUCT="Red Hat Enterprise Linux 8"
REDHAT_BUGZILLA_PRODUCT_VERSION=8.4
REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux"
REDHAT_SUPPORT_PRODUCT_VERSION="8.4"

• Kernel (e.g. uname -a): Linux localhost.localdomain 4.18.0-305.10.2.el8_4.x86_64 Init #1 SMP Mon Jul 12 04:43:18 EDT 2021 x86_64 x86_64 x86_64 GNU/Linux

• Others:

Relevant Logs

Aug 12 11:23:39 localhost.localdomain microshift[7840]: error: rawResources failed to read Resources: YAML file [klusterlet-kubeconfighub.yaml] encounters a format error.
Aug 12 11:23:39 localhost.localdomain microshift[7840]: error converting YAML to JSON: yaml: invalid map key: map[interface {}]interface {}{".kubeconfig":interface {}(nil)}
Aug 12 11:23:39 localhost.localdomain systemd[1]: microshift.service: Main process exited, code=exited, status=1/FAILURE
Aug 12 11:23:39 localhost.localdomain systemd[1]: microshift.service: Failed with result 'exit-code'.