Use PackageLicenseExpression; update to .NET SDK 2.2 (#1365)

Author: chrisdunelm

.travis.yml

@@ -1,13 +1,13 @@
 language: csharp
 mono: none
-dotnet: 2.1.101
-dist: trusty
+dotnet: 2.2.104
+dist: xenial
 
 # Install the .NET Core 1.0 runtime as that's what we build and test against
 addons:
   apt:
     sources:
-    - sourceline: 'deb [arch=amd64] https://packages.microsoft.com/repos/microsoft-ubuntu-trusty-prod trusty main'
+    - sourceline: 'deb [arch=amd64] https://packages.microsoft.com/repos/microsoft-ubuntu-xenial-prod xenial main'
       key_url: 'https://packages.microsoft.com/keys/microsoft.asc'
     packages:
     - dotnet-sharedframework-microsoft.netcore.app-1.0.8

ClientGenerator/src/googleapis/codegen/languages/csharp/default/templates/___package_name___/___package_name___.csproj.tmpl

@@ -8,7 +8,7 @@
     <Copyright>Copyright 2017 {% if api.ownerName == 'Google' %}Google Inc.{% else %}{{ api.ownerName }}{% endif %}</Copyright>
     <PackageTags>Google</PackageTags>
     <PackageProjectUrl>https://github.com/google/google-api-dotnet-client</PackageProjectUrl>
-    <PackageLicenseUrl>http://www.apache.org/licenses/LICENSE-2.0</PackageLicenseUrl>
+    <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
     <RepositoryType>git</RepositoryType>
     <RepositoryUrl>https://github.com/google/google-api-dotnet-client</RepositoryUrl>
     <PackageIconUrl>https://www.gstatic.com/images/branding/product/1x/google_developers_64dp.png</PackageIconUrl>

Src/Support/CommonProjectProperties.xml

@@ -7,7 +7,7 @@
     <Copyright>Copyright 2017 Google Inc.</Copyright>
     <PackageTags>Google</PackageTags>
     <PackageProjectUrl>https://github.com/googleapis/google-api-dotnet-client</PackageProjectUrl>
-    <PackageLicenseUrl>http://www.apache.org/licenses/LICENSE-2.0</PackageLicenseUrl>
+    <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
     <RepositoryType>git</RepositoryType>
     <RepositoryUrl>https://github.com/googleapis/google-api-dotnet-client</RepositoryUrl>
     <PackageIconUrl>https://www.gstatic.com/images/branding/product/1x/google_developers_64dp.png</PackageIconUrl>

global.json

@@ -1,5 +1,5 @@
 {
   "sdk": {
-    "version": "2.1.101"
+    "version": "2.2.100"
   }
 }