Update galaxy roles for Ansible 2.2 compatibility

[fullyint]

MailHog. This PR fixes #679, a conflict between an out-of-date MailHog galaxy role and Ansible 2.2 (also noted at discourse). Note that the latest MailHog role switches to using mhsendmail, "a sendmail replacement for MailHog," so dev.yml no longer needs the ssmtp role and group_vars/development/mail.yml no longer needs the ssmtp variables. We could potentially move the one remaining variable to group_vars/development/main.yml and remove the mail.yml file.

Logrotate. This PR also fixes a conflict between the logrotate galaxy role and Ansible 2.2. The out-of-date logrotate role included a "bare" variable which now fails in Ansible 2.2. This PR updates to latest logrotate role version that has this update:

- with_items: logrotate_scripts
+ with_items: "{{ logrotate_scripts }}"

NTP. This PR replaces the resmo.ntp galaxy role with the geerlingguy.ntp role, which may have a little more activity. In this latter, the task "Set the correct timezone" replaces our common role's timedatectl set-timezone command. The two tasks do the same thing. The timedatectl manpage says the set-timezone command "will alter the /etc/localtime symlink," which is what the geerlingguy role does manually. Note: geerlingguy's role uses the variable ntp_timezone so I renamed the Trellis default_timezone variable to ntp_timezone.

Other roles. The PR also updates the geerlingguy.composer and geerlingguy.daemonize roles. These changes appear minor, not requiring discussion.

Tested on Ansible versions 2.0.2.0, 2.1.1.0, and 2.2.0.0

[swalkinshaw]

Everything looks good 👍