Allow maria to start with one node

* gofmt stuff
[#75134504]
Refactor test file to make file shorter

[#75134504]
Refactor Maria start script

*Flatten logic for readability

[#75134504]
Included mariadb package in mysql-broker VM.

Symlinked mysql client to /usr/local/bin in both mysql and mysql-broker
VMs.  For convenience using mysql on the bosh vms.
Added optional printing of logs to make tests shut up

* one more extraction from tests
[#75134504]