Feat multiple db solr config

[erdnaxelaweb]

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	no

• Add SOLR_CORES env variable on solr container to define the core(s) name. (default = "collection1")
• Add DATABASE_PREFIXES env variable on engine container. This var define the prefix used to name the

[Plopix]

yes! @florianalexandre great job. @andrerom do you want to review that one? if you see anything weird first. I will check in details later.

[Plopix]

@florianalexandre we might want to do something here: https://github.com/ezsystems/launchpad/blob/master/payload/dev/solr/entrypoint.bash

[erdnaxelaweb]

@Plopix fixed and squashed

[Plopix]

Close in favor to: https://github.com/ezsystems/launchpad/pull/37

@florianalexandre amazing job