[COMMON] Enforce checkbashisms tox profile

[COMMON] Enforce checkbashisms tox profile

- add checkbahims to tox.ini default profiles
- remove -f options to unforce bashisms detection in explicit bash
  scripts and to differentiate treatments between bash and sh
- migrate #!/bin/bash shebangs to #!/bin/sh for scripts without bashisms
  The following scripts have not been migrated since they still use
  bashisms difficult to migrate (mostly arrays - more details below)

./kubernetes/common/mariadb-init/resources/config/db_init.sh
./kubernetes/portal/components/portal-mariadb/resources/config/ \
mariadb/docker-entrypoint.sh
./kubernetes/helm/plugins/deploy/deploy.sh
./kubernetes/helm/plugins/undeploy/undeploy.sh
./kubernetes/sdnc/components/sdnc-prom/resources/bin/ensureSdncActive.sh

$ find . -not -path '*/\.*' -name *.sh -exec checkbashisms -f {} + 2>&1\
| grep line | cut -d' ' -f 7- | sort | uniq -c | sort -k1,1nr
     18 (bash arrays, ${name[0|*|@]}):
      2 (declare):
      1 ($FUNCNAME):
      1 (shopt):
      1 (trap with ERR|DEBUG|RETURN):

https://mywiki.wooledge.org/Bashism#Arrays
https://mywiki.wooledge.org/Bashism#Special_Variables
https://mywiki.wooledge.org/Bashism#Builtins
https://www.oilshell.org/release/0.5.alpha2/test/spec.wwz/builtin-trap.html

Issue-ID: OOM-2643
Signed-off-by: Guillaume Lambert <guillaume.lambert@orange.com>
Change-Id: Id06ad1d45004321a293bdd26038d8da5f7b6b4ac