[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/dcaegen2-services/resources/external/schemas/sa91-rel16/sliceNrm.yaml b/kubernetes/dcaegen2-services/resources/external/schemas/sa91-rel16/sliceNrm.yaml
index 1fa8d70..9bf5319 100644
--- a/kubernetes/dcaegen2-services/resources/external/schemas/sa91-rel16/sliceNrm.yaml
+++ b/kubernetes/dcaegen2-services/resources/external/schemas/sa91-rel16/sliceNrm.yaml
@@ -215,7 +215,7 @@
     ServiceProfile:
       type: object
       properties:
-          serviceProfileId: 
+          serviceProfileId:
             type: string
           plmnInfoList:
             $ref: 'nrNrm.yaml#/components/schemas/PlmnInfoList'
@@ -296,7 +296,7 @@
        type: array
        items:
         $ref: '#/components/schemas/ServiceProfile'
-            
+
     SliceProfileList:
       type: array
       items:
@@ -379,14 +379,14 @@
                 ipAddress:
                   $ref: '#/components/schemas/IpAddress'
                 logicInterfaceId:
-                  type: string 
+                  type: string
                 nextHopInfo:
-                  type: string 
+                  type: string
                 qosProfile:
-                  type: string 
+                  type: string
                 epApplicationRefs:
                   $ref: 'comDefs.yaml#/components/schemas/DnList'
-                      
+
 #-------- Definition of JSON arrays for name-contained IOCs ----------------------
     SubNetwork-Multiple:
       type: array