Ensure database usernames and database names are in back ticks

[gregharvey]

We had a build fail because the database / username had a hyphen. The task was:

TASK [database_backup/database_backup-mysql : Create/update mysql user for TCP connections.] ***

The error seemed to be caused by the lack of back-ticks around the longer db name with a hyphen in the queries, for example, this failed...

TRIGGER ON somedatabase_contact-us.*

...but this succeeded:

TRIGGER ON `somedatabase_contact-us`.*

We should check for / clean up queries like this.

[gregharvey]

Probably related to this:

• https://github.com/codeenigma/ce-deploy/pull/255/files#diff-54bc4a726846c53c0449e5bf9a090c8cd074eba92fb23bf330f54153e5fe32dbR10

We could also look at handling databases properly via the MySQL plugin instead.

[gregharvey]

This got done in #258 !