ServiceManager class has been introduced to handle service configuration at
SQL level (with a LegacyServiceManager alternative for non-refactored services).
These new classes take the responsibility of rate limits and quota checking.
Tests have been added for ServiceManager and rate limits, but currently they
check only the limits configuration since Lua support would be needed
to use rratelimit with MockRedis.
Instead of getting (deleted and untracked files):
```
$ git status
# On branch master
# Your branch is ahead of 'origin/master' by 20 commits.
#
# Changes not staged for commit:
# (use "git add/rm <file>..." to update what will be committed)
# (use "git checkout -- <file>..." to discard changes in working directory)
#
# deleted: cdb_dataservices_server--0.20.0--0.21.0.sql
# deleted: cdb_dataservices_server--0.21.0--0.20.0.sql
# deleted: cdb_dataservices_server--0.21.0.sql
# modified: cdb_dataservices_server.control
#
# Untracked files:
# (use "git add <file>..." to include in what will be committed)
#
# cdb_dataservices_server--0.21.0--0.22.0.sql
# cdb_dataservices_server--0.22.0--0.21.0.sql
# cdb_dataservices_server--0.22.0.sql
# old_versions/cdb_dataservices_server--0.20.0--0.21.0.sql
# old_versions/cdb_dataservices_server--0.21.0--0.20.0.sql
# old_versions/cdb_dataservices_server--0.21.0.sql
no changes added to commit (use "git add" and/or "git commit -a")
```
you'd get something like:
```
$ git status
# On branch master
# Your branch is ahead of 'origin/master' by 20 commits.
#
# Changes to be committed:
# (use "git reset HEAD <file>..." to unstage)
#
# renamed: cdb_dataservices_server--0.20.0--0.21.0.sql -> old_versions/cdb_dataservices_server--0.20.0--0.21.0.sql
# renamed: cdb_dataservices_server--0.21.0--0.20.0.sql -> old_versions/cdb_dataservices_server--0.21.0--0.20.0.sql
# renamed: cdb_dataservices_server--0.21.0.sql -> old_versions/cdb_dataservices_server--0.21.0.sql
#
# Changes not staged for commit:
# (use "git add <file>..." to update what will be committed)
# (use "git checkout -- <file>..." to discard changes in working directory)
#
# modified: cdb_dataservices_server.control
#
# Untracked files:
# (use "git add <file>..." to include in what will be committed)
#
# cdb_dataservices_server--0.21.0--0.22.0.sql
# cdb_dataservices_server--0.22.0--0.21.0.sql
# cdb_dataservices_server--0.22.0.sql
```
which is nicer IMHO.
