Start development Key seed id from 1 to prevent `Couldn't find Key with id=0` crash on MySQL.

Created by: cirosantilli

If it starts from 0, then bundle exec rake gitlab:setup gives:

== Seed from /home/git/gitlab/db/fixtures/development/11_keys.rb
Couldn't find Key with id=0
[exception trace and exit error]

for the MySQL database only.

Starting from 1 works for both MySQL and PostgreSQL.

Probably linked to the fact that id in MySQL is auto_increment, which starts from 1?