Remove .NETCore project from VS 2015 solution since we now use the new csproj based project (which is only available for VS 2017+).

Author: drieseng

src/SshNet.Security.Cryptography.VS2015.sln

@@ -27,8 +27,6 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SshNet.Security.Cryptograph
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SshNet.Security.Cryptography.NET45+Win8+WPA81", "SshNet.Security.Cryptography.NET45+Win8+WPA81\SshNet.Security.Cryptography.NET45+Win8+WPA81.csproj", "{F9CC3198-697C-439A-B64B-F9DFAF3EBFF7}"
 EndProject
-Project("{8BB2217D-0F2D-49D1-97BC-3654ED321F3B}") = "SshNet.Security.Cryptography.NETCore", "SshNet.Security.Cryptography.NETCore\SshNet.Security.Cryptography.NETCore.xproj", "{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}"
-EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SshNet.Security.Cryptography.NET45+Win8+WPA81.Tests", "..\test\SshNet.Security.Cryptography.NET45+Win8+WPA81.Tests\SshNet.Security.Cryptography.NET45+Win8+WPA81.Tests.csproj", "{52C7ED73-0D41-4FEF-8A88-1493563C0C77}"
 EndProject
 Global
@@ -197,22 +195,6 @@ Global
 		{F9CC3198-697C-439A-B64B-F9DFAF3EBFF7}.Release|x64.Build.0 = Release|Any CPU
 		{F9CC3198-697C-439A-B64B-F9DFAF3EBFF7}.Release|x86.ActiveCfg = Release|Any CPU
 		{F9CC3198-697C-439A-B64B-F9DFAF3EBFF7}.Release|x86.Build.0 = Release|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Debug|ARM.ActiveCfg = Debug|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Debug|ARM.Build.0 = Debug|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Debug|x64.ActiveCfg = Debug|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Debug|x64.Build.0 = Debug|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Debug|x86.ActiveCfg = Debug|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Debug|x86.Build.0 = Debug|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Release|Any CPU.Build.0 = Release|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Release|ARM.ActiveCfg = Release|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Release|ARM.Build.0 = Release|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Release|x64.ActiveCfg = Release|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Release|x64.Build.0 = Release|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Release|x86.ActiveCfg = Release|Any CPU
-		{F9E626BF-AB3A-47C7-B3E6-C51C44A17CA3}.Release|x86.Build.0 = Release|Any CPU
 		{52C7ED73-0D41-4FEF-8A88-1493563C0C77}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{52C7ED73-0D41-4FEF-8A88-1493563C0C77}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{52C7ED73-0D41-4FEF-8A88-1493563C0C77}.Debug|ARM.ActiveCfg = Debug|Any CPU