Getting rid or changing the url check for grafana datasource url's

[Faffnir]

Currently every datasource is checked if it is starting with http(s) which leads to an error in the newest version of grafana (4.6.0) which supports postgresql as a datasource.
With this check it is impossible to set a valid postgresql datasource.

Valid solutions would be to remove this check or check the datasource type before.
What do you think?

[btravouillon]

Hi @Faffnir,

Thank you for reporting this issue.
Indeed the url parameter must be host:port for both mysql and postgres datasources.

I will give a try with the check of the datasource type.

[btravouillon]

By looking at the granafa code, DataSource.Url is a string. I can't find any test nor documentation about a formal format for this string, thus we can expect other format than https?://www.example.com or host:port in the future.

@Faffnir , can you submit a PR with your change?

[btravouillon]

Fix by #76
Thank you @Faffnir .

[Faffnir]

thank you for the fast merge @actatux