[console] Apply latest changes from completion package

The used auto-completion package https://github.com/stecman/symfony-console-completion was changed recently and changes are significant enough to be applied to In-Portal as well.

Changes include:

• built-in support for completing command names in "help" command
• support for completion on CentOS with Bash 3.x
• error reporting for cases, when "bash-completion" package isn't installed
• constant "You have new mail" message interfering with auto-completion

Solution

1. use DEV version of package in Composer
2. update Composer dependencies
3. regenerate Bash completion hook, that is stored under "/tools/" folder

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