[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/consul/resources/config/consul-agent-config/certs/client-cert-onap.crt.pem b/kubernetes/consul/resources/config/consul-agent-config/certs/client-cert-onap.crt.pem
index 5696aa3..b842710 100644
--- a/kubernetes/consul/resources/config/consul-agent-config/certs/client-cert-onap.crt.pem
+++ b/kubernetes/consul/resources/config/consul-agent-config/certs/client-cert-onap.crt.pem
@@ -1,6 +1,6 @@
 Bag Attributes
     friendlyName: tomcat
-    localKeyID: 54 69 6D 65 20 31 34 39 33 33 32 33 39 32 32 37 35 31 
+    localKeyID: 54 69 6D 65 20 31 34 39 33 33 32 33 39 32 32 37 35 31
 subject=/C=CA/ST=Ontario/L=Ottawa/O=ONAP/OU=ONAP/CN=ONAP
 issuer=/C=CA/ST=Ontario/L=Ottawa/O=ONAP/OU=ONAP/CN=ONAP
 -----BEGIN CERTIFICATE-----