Fixes #19646 - improve inline help

Fixes #15861 - increase size of audited_changes column

In mysql text type is limited to 64K, while in psql
there's no limit. Changeing type to MEDIUMTEXT,
which limited to 16MB, should solve this issue in mysql

Fixes #19700 - update rubocop rules

The following changes have been made:

- Performance/RedundantMerge:
changes lines such as:
```not_found_message.merge! :message => options```
to:
```not_found_message[:message] = options```

- converts str.match() to str =~ ()...

Fixes #19161 - expand value plus icon change to minus icon after click

Fixes #19612 - CVE-2017-7505 don't expose admin to taxed users

fixes #19340 - replace all new_host calls with new_vm

Fixes #19632 - changed shim and grub1 PXE names

Fixes #19672 - fix bulk actions for plugins

Fixes #19459 - improve vm boot failure feedback

To be able to override the wait for vm ready we need to move
it to compute resource definition. Also improve Openstack one

Fixes #16159 - Rename mail alerts to not be Puppet specific

Right now, under 'my account', users get emails with alerts about the
status of their hosts regarding configuration management (e.g: if there
was an error, get an alert, or get a weekly summary of all hosts...