[COMMON] Add and run pre-commit linters via tox

- create a .pre-commit-config.yaml configuration file with
  * gitlint
  * trailing blanks linter
  * tabs removal linter
    - exclude .git folder from it
    - exclude Makefiles since tabs are mandatory by default in them
- create a tox pre-commit profile to run it from tox
  note gitlint is not runnable at this pre-commit stage
- create pre-commit-install and pre-commit-uninstall tox profiles to
  (un)install hooks locally and (un)perform tests at each "git commit"
  call (i.e. without calling manually the pre-commit tox profile)
- precise pre-commit stages/types in the pre-commit configuration file
  so that hooks are installed correctly. This avoids messages about
  skipped tests when they are run at a wrong stage.

Issue-ID: OOM-2643
Signed-off-by: guillaume.lambert <guillaume.lambert@orange.com>
Change-Id: Ie95bb4f6f90be80b05a1398973caffeff7936881
diff --git a/kubernetes/sdnc/resources/geo/bin/sdnc.isPrimaryCluster b/kubernetes/sdnc/resources/geo/bin/sdnc.isPrimaryCluster
index ffd0448..8b489e0 100755
--- a/kubernetes/sdnc/resources/geo/bin/sdnc.isPrimaryCluster
+++ b/kubernetes/sdnc/resources/geo/bin/sdnc.isPrimaryCluster
@@ -26,10 +26,10 @@
 
 case $IS_PRIMARY_CLUSTER in
 true|false)
-	echo $IS_PRIMARY_CLUSTER
-	;;
+    echo $IS_PRIMARY_CLUSTER
+    ;;
 *)
-	echo "NOT CLUSTERED"
-	exit 1
-	;;
+    echo "NOT CLUSTERED"
+    exit 1
+    ;;
 esac