Fix for version comparions from strings to semver (#4599)

* Fix for version comparions from strings to semver

See #3002 for more detail

* Include pre-releases in the semver ranges

This is important when testing against alpha and beta builds of
Kubernetes along with environments that use pre-releases to denote
things other than pre-releases (e.g., gke denotes the environment
with a pre-releases)

stable/fluent-bit/Chart.yaml

@@ -1,5 +1,5 @@
 name: fluent-bit
-version: 0.2.13
+version: 0.2.14
 appVersion: 0.12.15
 description: Fast and Lightweight Log/Data Forwarder for Linux, BSD and OSX
 keywords:

stable/fluent-bit/templates/_helpers.tpl

@@ -19,7 +19,7 @@ We truncate at 63 chars because some Kubernetes name fields are limited to this
 Return the appropriate apiVersion for RBAC APIs.
 */}}
 {{- define "rbac.apiVersion" -}}
-{{- if ge .Capabilities.KubeVersion.Minor "8" -}}
+{{- if semverCompare "^1.8-0" .Capabilities.KubeVersion.GitVersion -}}
 "rbac.authorization.k8s.io/v1"
 {{- else -}}
 "rbac.authorization.k8s.io/v1beta1"