(chocolatey#3193) Add ability to ignore current http cache

The changes here will add a global option that can be used
by the user to ignore any existing http cache that has been
created prior to the execution of the current command.

Using the option will still create a new cache for the running
execution and reuse that created cache in the current context,
and can be reused normally when not using the argument in the
future.

src/chocolatey/infrastructure.app/builders/ConfigurationBuilder.cs

@@ -441,6 +441,15 @@ private static void SetGlobalOptions(IList<string> args, ChocolateyConfiguration
                         .Add("skipcompatibilitychecks|skip-compatibility-checks",
                             "SkipCompatibilityChecks - Prevent warnings being shown before and after command execution when a runtime compatibility problem is found between the version of Chocolatey and the Chocolatey Licensed Extension. Available in 1.1.0+",
                             option => config.DisableCompatibilityChecks = option != null)
+                        .Add("ignore-http-cache",
+                            "IgnoreHttpCache - Ignore any HTTP caches that has previously been created when querying sources, and create new caches. Available in 2.1.0+",
+                            option =>
+                            {
+                                if (option != null)
+                                {
+                                    config.CacheExpirationInMinutes = -1;
+                                }
+                            });
                         ;
                 },
                 (unparsedArgs) =>

src/chocolatey/infrastructure.app/configuration/ChocolateyConfiguration.cs

@@ -38,6 +38,7 @@ public ChocolateyConfiguration()
             RegularOutput = true;
             PromptForConfirmation = true;
             DisableCompatibilityChecks = false;
+            CacheExpirationInMinutes = 30;
             SourceType = SourceTypes.Normal;
             Information = new InformationCommandConfiguration();
             Features = new FeaturesConfiguration();
@@ -340,6 +341,15 @@ private void AppendOutput(StringBuilder propertyValues, string append)
         public bool ApplyInstallArgumentsToDependencies { get; set; }
         public bool IgnoreDependencies { get; set; }
 
+        /// <summary>
+        /// Gets or sets the the time the cache is considered to have expired in minutes.
+        /// </summary>
+        /// <value>
+        /// The cache expiration in minutes.
+        /// </value>
+        /// <remarks>specifying a negative number disables the caching completely.</remarks>
+        public int CacheExpirationInMinutes { get; set; }
+
         public bool AllowDowngrade { get; set; }
         public bool ForceDependencies { get; set; }
         public string DownloadChecksum { get; set; }

src/chocolatey/infrastructure.app/nuget/ChocolateySourceCacheContext.cs

@@ -1,14 +1,9 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace chocolatey.infrastructure.app.nuget
+namespace chocolatey.infrastructure.app.nuget
 {
+    using System;
     using System.Threading;
     using Alphaleonis.Win32.Filesystem;
-    using configuration;
+    using chocolatey.infrastructure.app.configuration;
     using NuGet.Protocol.Core.Types;
 
     public class ChocolateySourceCacheContext : SourceCacheContext
@@ -20,8 +15,18 @@ public class ChocolateySourceCacheContext : SourceCacheContext
         private readonly string _chocolateyCacheLocation;
 
         public ChocolateySourceCacheContext(ChocolateyConfiguration config)
-        {
+        { 
             _chocolateyCacheLocation = config.CacheLocation;
+
+            if (config.CacheExpirationInMinutes <= 0)
+            {
+                MaxAge = DateTime.UtcNow;
+                RefreshMemoryCache = true;
+            }
+            else
+            {
+                MaxAge = DateTime.UtcNow.AddMinutes(-config.CacheExpirationInMinutes);
+            }
         }
 
         public override string GeneratedTempFolder