Check that Ansible default temp directory is writable, warn user with a workaround otherwise

[ludovicc]

Error found during the first execution of setup.sh

TASK [silpion.util : Disable requiretty in SUDO] ***********************************************************************************
 [WARNING]: when statements should not include jinja2 templating delimiters such as {{ }} or {% %}. Found: {{
util_fact_ssh_pipelining }}

fatal: [localhost]: FAILED! => {"changed": false, "module_stderr": "/usr/bin/python: can't open file '/home/dp/.ansible/tmp/ansible-tmp-1547542853.66-137267324674683/AnsiballZ_lineinfile.py': [Errno 13] Permission denied\n", "module_stdout": "", "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", "rc": 2}

Add a check ensuring that tmp dir is writable during the execution of remote commands, propose a workaround if that is not the case.

[ludovicc]

Issue experienced by @DimitriPapadopoulos