Update and use install-plugins.sh (#756)

* Download install-plugins.sh manually from remote

* Reformat

* Goimports

* Use install-plugins.sh bundled with the operator

* Fix compile error

* Update install-plugins.sh

* Remove redundant param to new install-plugins.sh

Co-authored-by: Piotr Ryba <pryba@virtuslab.com>

api/v1alpha2/zz_generated.deepcopy.go

@@ -23,7 +23,7 @@ package v1alpha2
 
 import (
 	corev1 "k8s.io/api/core/v1"
-	"k8s.io/api/rbac/v1"
+	rbacv1 "k8s.io/api/rbac/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 )
 
@@ -400,7 +400,7 @@ func (in *JenkinsSpec) DeepCopyInto(out *JenkinsSpec) {
 	in.ConfigurationAsCode.DeepCopyInto(&out.ConfigurationAsCode)
 	if in.Roles != nil {
 		in, out := &in.Roles, &out.Roles
-		*out = make([]v1.RoleRef, len(*in))
+		*out = make([]rbacv1.RoleRef, len(*in))
 		copy(*out, *in)
 	}
 	in.ServiceAccount.DeepCopyInto(&out.ServiceAccount)