problem with plugin PhpCpd

[zsadmin]

Problem with plugin: it sends the wrong command to ignore the files. When we ignore directory, we use --exclude path/dir_1 --exclude path/dir_2 --exclude path/dir_3 everything works correctly but when we want to exclude file - PhpCpd.php sends command like --names-exclude path/file_1 --names-exclude path/file_2 --names-exlcude path/file_3 and files will be scanned for copy/past, to ignore all three file we have to use command like --names-exclude file_1,file_2,file_3 without paths.

Contribution Type: bug fix

This pull request affects the following areas:

• [ ] Front-End
• [ ] Builder
• [x] Build Plugins

In raising this pull request, I confirm the following (please check boxes):

• [x] I have read and understood the contributing guidelines?
• [x] I have checked that another pull request for this purpose does not exist.
• [x] I have considered, and confirmed that this submission will be valuable to others.
• [ ] I have created or updated the relevant documentation for this change on the PHPCI Wiki.
• [ ] Do the PHPCI tests pass?

Detailed description of change: