[mono] Linux build fixes (mono#128)

* [mono] Fix casing for `DotNet*` to be consistent and match the file on

.. disk.

* [mono] Remove Microsoft.DotNet.MSBuildSdkResolver on linux for the

.. bootstrap build. This is because it depends on a native lib,
libhostfxr*, which is not present in the bootrap msbuild, which breaks
the resolver and thus the build. Removing this should be fine, because
msbuild then just falls back to the bundled SDKs.

* [mono] Run the dotnet-install.sh script with `bash` instead of `sh` as

.. it breaks for `set -o pipefail` on ubuntu 16.04 .

* [mono] Skip copying the native lib, libhostfxr* for Linux

.. because this might or might not work on whatever distribution we are
actually building on.

* [mono] Sort both canonical and new files list, as the order can differ

.. between linux and macOS.

Merge pull request mono#110 from radical/update-master

[mono] Update SDKs to track cli branch `release/2.1.8xx`

Merge pull request mono#53 from radical/update-script

[mono] Add support for fetching libhostfxr* when updating SDKs

Merge pull request mono#49 from radical/xm-upstream-master-merge

Merge upstream master, in preparation for port to the new build system

Merge pull request mono#49 from radical/xm-upstream-master-merge

Merge upstream master, in preparation for port to the new build system

[mono] safer cleanup

Since we are very close to a release, let's clean up the bigger files.
And later we can cleanup fully.

Merge branch 'xplat-master' into xplat-2017-02

d15.1 Beta preview 2, corresponding to Mono 4.8.0.524

Merge pull request dotnet#1766 from rainersigwald/item-case-sensitivi…

…ty-1751

Item references should be case-insensitive

Work around dotnet#1675 for C++ Code Analysis scenarios (dotnet#1699)

This addresses the repro case for dotnet#1675, but not its root cause. By
providing a `codeBase` for the CA assemblies, we ensure that any running
MSBuild can find them when deserializing a log message.