Added a suppression for a CA warning that cannot be fixed int net452.

Author: ckadluba

test/Serilog.Sinks.MSSqlServer.Tests/GlobalSuppressions.cs

@@ -8,3 +8,4 @@
 [assembly: SuppressMessage("Globalization", "CA1303:Do not pass literals as localized parameters", Justification = "Supplying string literals and not using resources is accepted within this project.", Scope = "namespaceanddescendants", Target = "Serilog.Sinks.MSSqlServer.Tests")]
 [assembly: SuppressMessage("Naming", "CA1707:Identifiers should not contain underscores", Justification = "Member names must match SQL server master DB objects.", Scope = "type", Target = "~T:Serilog.Sinks.MSSqlServer.Tests.TestUtils.sp_pkey")]
 [assembly: SuppressMessage("Naming", "CA1707:Identifiers should not contain underscores", Justification = "Member names must match SQL server master DB objects.", Scope = "type", Target = "~T:Serilog.Sinks.MSSqlServer.Tests.TestUtils.SysIndex_CCI")]
+[assembly: SuppressMessage("Globalization", "CA1307:Specify StringComparison", Justification = "In net452 there is no Contains() overload that accepts a StringComparison specifier", Scope = "member", Target = "~M:Serilog.Sinks.MSSqlServer.Tests.TestUtils.DatabaseTestsBase.VerifyLogMessageWasWritten(System.String)")]