Allow customize http vhost config using HttpdCustomization.CustomConfigSecret

[stuggi]

This change allows to customize the httpd vhost config using this parameter to specify a secret that contains service config data. The content of each provided snippet gets rendered as a go template and placed into /etc/httpd/conf/httpd_custom__ .
At the end of the vhost config in the default httpd template these custom configs get included using Include conf/httpd_custom_<endpoint>_*.

For information on how sections in httpd configuration get merged, check section "How the sections are merged" in https://httpd.apache.org/docs/current/sections.html#merging

All possible parameters which can be use in a template can be looked up in the -config-data secret of the service like:

$ oc get secret -n openstack cinder-config-data -o json | jq -r .data.TemplateParameters | base64 -d

or in the running pod of the service in the file:

$ cat /var/lib/config-data/default/TemplateParameters

The content is a versioned dump of the parameters of the service operator, like:

DatabaseConnection: mysql+pymysql://user:[email protected]/keystone?read_default_file=/etc/my.cnf KeystoneEndpointInternal: https://keystone-internal.openstack.svc:5000 KeystoneEndpointPublic: https://keystone-public-openstack.apps-crc.testing TransportURL: rabbit://user:[email protected]:5671/?ssl=1 VHosts:
    internal:
        Override: false
        SSLCertificateFile: /etc/pki/tls/certs/internal.crt
        SSLCertificateKeyFile: /etc/pki/tls/private/internal.key
        ServerName: cinder-internal.openstack.svc
        TLS: true
    public:
        Override: false
        SSLCertificateFile: /etc/pki/tls/certs/public.crt
        SSLCertificateKeyFile: /etc/pki/tls/private/public.key
        ServerName: cinder-public.openstack.svc
        TLS: true
MemcachedServersWithInet: inet:[memcached-0.memcached.openstack.svc]:11211 ...

Depends-On: openstack-k8s-operators/lib-common#591
Depends-On: openstack-k8s-operators/lib-common#593

Jira: https://issues.redhat.com/browse/OSPRH-13100

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[stuggi]

/retest

[stuggi]

pinging container registry quay.rdoproject.org: Get "https://quay.rdoproject.org/v2/": dial tcp 38.129.56.158:443: i/o timeout

[stuggi]

/test cinder-operator-build-deploy-tempest

[stuggi]

/retest

[softwarefactory-project-zuul]

Merge Failed.

This change or one of its cross-repo dependencies was unable to be automatically merged with the current state of its repository. Please rebase the change and upload a new patchset.
Warning:
Error merging github.com/openstack-k8s-operators/cinder-operator for 480,fdf447a3f0e46e43e4430c46468e69acc696a6f0

[openshift-ci]

@stuggi: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/cinder-operator-build-deploy-kuttl	dc99d02	link	true	/test cinder-operator-build-deploy-kuttl

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