Issue #525 - Install sqlite3 at version required by EntityFramework.

[AlexChesser]

In order to address an issue with running a sqlite3 database on aspnet-docker-linux
a version of sqlite3 must be installed that is greater than or equal to 3.7.15
which is not available on the default apt sources list in this image.
ref: dotnet/efcore#3089
aspnet/aspnet-docker#121

[peterblazejewicz]

@AlexChesser
Thanks for the split. I've followed discussion on aspnet-docker as well, so I believe the stance to split PR was correct.
Will review your PR asap

[peterblazejewicz]

note FYI, today I have to modify web section to get it running:

"commands": {
    "web": "Microsoft.AspNet.Server.Kestrel --server.urls http://0.0.0.0:5000",
    "ef": "EntityFramework.Commands"
  },

http://tattoocoder.azurewebsites.net/asp-net-5-continuous-integration-with-travis-ci-tutum-docker-webhooks-and-azure/

[peterblazejewicz]

I've tested both Mono and CoreCLR based images and they works fine with that change.
The change is crucial to run EF template on Docker.

[peterblazejewicz]

@sayedihashimi
It would be good to ship this change to NPM.
I'll make a tracking issue for RC2 release that will simplify Dockerfile back:
aspnet/aspnet-docker#122 (comment)