Support Lykke settings interface

[olemis]

Extracted from Lykke 1.3.0 specs

• The app should read settings from the URL or local file specified in the SettingsUrl environment variable
• What exactly (URL or path to the local file) is specified in the SettingsUrl should be determined automatically
• Settings will be provided in the Json format
• Settings should contain NetworkType field, if this is applicable for the given blockchain. Available values for this field are: Test, Main .
• For the moment endpoints should fail if NetworkType is set to Test since there is no Skycoin testnet yet .
• At least, logs and data connection string should be specified in the different settings fields. More grained separation is at your discretion.
• When HTTP status code 403 is received as response of an request to the Azure Storage, performing by the app, settings should be reloaded and the request should be repeated
• Lykke.SettingsReader Nuget package should be used to read the settings