Turn privates to protecteds to fix EmailMan overrides

[pgorod]

Description

Problems customizing EmailMan class with a custom class.

How To Test This

Create custom class in custom/modules/EmailMan/CustomEmailMan.phpwith something like this...

require_once 'modules/EmailMan/EmailMan.php';

class CustomEmailMan extends EmailMan {

    public function sendEmail(SugarPHPMailer $mail, $save_emails = 1, $testmode = false, $previewmode = false) {
         [... code copied from original function, using function $this->shouldBlockEmail() ....]
    }
}

You get a PHP error:

Sun Aug  9 18:47:59 2020 [1183][1][PHP S] [E_ERROR] 
'Uncaught Error: Call to private method EmailMan::shouldBlockEmail() 
from context 'CustomEmailMan' 
in custom/modules/EmailMan/CustomEmailMan.php:126

This is wrong because this class is meant to be overridable, so these functions should be either public or protected.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Final checklist

• My code follows the code style of this project found here.
• My change requires a change to the documentation.
• I have read the How to Contribute guidelines.

[codecov-commenter]

Codecov Report

Merging #8841 into hotfix-7.10.x will not change coverage.
The diff coverage is 0.00%.

@@              Coverage Diff               @@
##           hotfix-7.10.x    #8841   +/-   ##
==============================================
  Coverage          10.69%   10.69%           
==============================================
  Files               3230     3230           
  Lines             241063   241063           
==============================================
  Hits               25792    25792           
  Misses            215271   215271