Fix typo in Metadata

[elnappo]

This typo leads to

ERROR! 'dependecies' is not a valid attribute for a RoleMetadata

The error appears to have been in '/***/roles/percona/meta/main.yml': line 2, column
1, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

---
galaxy_info:
^ here

Ansible failed to complete successfully. Any error output should be
visible above. Please fix these errors and try again.

[philkuz]

This is a really dumb error that is the only thing prevenging this role run smoothly. Can someone in hpcloud-mon get on this?