Do not sudo stat Ceph spec file on Ansible host

When the "Stat spec file on ansible host" task is run
from an Ansible runner container, the task fails with:

"module_stderr": "/bin/sh: line 1: sudo: command not found\n",

This patch removes "become: true" so that the task
no longer fails under these conditions.

It shouldn't be necessary to use sudo to stat this
file on a standard undercloud or in an Ansible runner
container. There are other tasks which use become
and other tasks which delegate to localhost, but
this task in the tripleo_cephadm role which uses both.

Change-Id: I1aab213206d32ffae2f9fea92970a4bf13801f16

tripleo_ansible/roles/tripleo_cephadm/tasks/pre.yaml

@@ -99,7 +99,6 @@
     path: "{{ tripleo_cephadm_spec_ansible_host }}"
   register: tripleo_cephadm_spec_stat_host
   delegate_to: localhost
-  become: true
 
 - name: push tripleo_cephadm_spec to bootstrap node if spec file exsits
   copy: