fix(operator): Attempt to fix all the major issues present atm against the newest jenkins lts version (#784)

* fix(seed): fix #742, workaround #698
Original fix proposal: https://github.com/jenkinsci/kubernetes-operator/issues/742#issuecomment-1304398590

* fix(install-plugin.sh): fix #758, #739
* the fix was original attempted here:
  https://github.com/jenkinsci/kubernetes-operator/pull/764 but was not
  working correctly due to 2-3 additional changes which needed to be
  done
* removed the openshift check because the env is not mention anywhere
  and also the new jenkins-plugin-cli does not a specific command for
  openshift. Finally this does not make any sense in general, the only
  problem in ocp will be the user id that will be mapped to a random uid
  but that's another story. The command to install the plugins should
  remain the same across different k8s flavours.

* fix(doc/test): fix /usr/bin/tini in any doc and validation

* fix(jenkins): remove AdminWhitelistRule to avoid jvm stack trace, see: https://www.jenkins.io/doc/book/security/controller-isolation/jep-235/#api-compatibility

* fix(seed): fix seed img built on a previous jvm, fix #761

* fix(plugin): update the base plugin to work with the newest version of
jenkins:lts

* fix(run): fix #778

* fix(backup): add a trap to remove the tmp dir if the tar fail, also fix: #770

* test(chart): update chart values for testing, will revert before merge

* fix(configmap): leftover

* fix(tests): fix seed job test

* fix(e2e)

* fix(e2e): helm

* fix(operator): update the temporary img to reflect latests changes

* Fix Helm e2e tests

* add trap in case of unwanted exit and make shellcheck happy

* chore(plugin): update git ver to 5.0.0

* fix(backup): always force delete the backup directory

* chore(operator): update the temporary img to reflect latest changes

* chore(jenkins): upgrade jenkins latest lts

pkg/client/jenkins.go

@@ -14,7 +14,7 @@ import (
 
 var (
 	errorNotFound = errors.New("404")
-	regex         = regexp.MustCompile("(<application-desc main-class=\"hudson.remoting.jnlp.Main\"><argument>)(?P<secret>[a-z0-9]*)")
+	regex         = regexp.MustCompile("(<application-desc><argument>)(?P<secret>[a-z0-9]*)")
 )
 
 // Jenkins defines Jenkins API.
@@ -159,7 +159,7 @@ func newClient(url, userName, passwordOrToken string) (Jenkins, error) {
 
 	httpClient := &http.Client{
 		Jar:     jar,
-		Timeout: 10 * time.Second,
+		Timeout: 20 * time.Second,
 	}
 
 	if len(userName) > 0 && len(passwordOrToken) > 0 {