Boot Menu/Order Functionality And some fixes

[catborise]

Hi retspen,

I added some features:

1. Update requirements file
2. Add pool selection option while creating an instance with a template
3. Add cache info for instance disk list
4. Add Boot menu enable / disable function
5. Add Boot order change function(disk/cdrom/network)
6. Add titles for some buttons
7. Fix some bugs
8. Fix some typos

I hope you will accept.

Thanks.

[retspen]

Thank you!

[catborise]

@Bandic007 i handle the situation which is absence of name.
It should work now properly