Kestrel on Linux now tries to load libuv.so instead of libuv.so.1

[moozzyk]

Recently the Kestrel web server was changed (aspnet/KestrelHttpServer#244) to use the built-in mechanism for loading native libraries (aspnet/dnx#402) to load libuv. Because of this change Kestrel no longer controls the exact name of the libuv library being loaded. Rather, the name from the DllImport attribute is used by the runtime to load the library. To make it work across platforms the name used in the DllImport attribute is just libuv and we let the runtime append the extension (.dll\.dylib\.so) specific to a given platform. As a result when running Kestrel on Linux the runtime will try to load libuv.so which is a breaking change from previous releases where Kestrel explicitly tried to load libuv.so.1.

Please use aspnet/KestrelHttpServer#323 for discussion.