Site hash never stored in configuration

The site hash is never stored in configuration and re-generated every time.
Merge pull request #1 from webflo/patch-1

Site hash never stored in configuration
Fix the name of the module in it .info.yml.
Merge branch '8.x-1.x' of github.com:amateescu/search_api_solr into 8.x-1.x
Update the code to account for the new Item and ResultSet classes.
Fix single/multi-value field handling, facets, highlighting and add tests!
Update for interface changes.
Merge pull request #2 from md-systems/8.x-1.x

Update for interface changes.
Update some server property names.
Update the code for recent search_api changes.
Add config schema for the solr backend. Fixes #3.
Remove unneeded hook_view_api() implementation. Fixes #6.
Update hooks documentation. Fixes #4.
Restore the hook_cron() implementation.
Restore the 'Solr config files form' functionality. Fixes #5.
Restore the functionality of using a specific HTTP method.
Restore Basic HTTP authentication functionality.
Small hook_help() update for core change.
Update for FormStateInterface
Merge pull request #8 from md-systems/8.x-1.x

Update for FormStateInterface