Upgrade Maven Surefire plugin to version 2.16

** Bug
    * [SUREFIRE-998] - Problems with Umlauts in <system-out> (and probably <system-err>) content of junit xml report.
    * [SUREFIRE-1003] - Does not run test ThreeTestFour.java which matches the include **/*Test*.java
    * [SUREFIRE-1005] - Tests are ignored when using dependenciesToScan on linux only
    * [SUREFIRE-1006] - Junit report xml invalid utf8-caracters
    * [SUREFIRE-1008] - Junit report xml invalid utf8-caracters
    * [SUREFIRE-1012] - runOrder doesn't seem to have an effect at all for TestNG tests
    * [SUREFIRE-1014] - Unparsable test report XML when sysout contains invalid XML
    * [SUREFIRE-1015] - Site menu is duplicated
    * [SUREFIRE-1016] - SCM link broken
    * [SUREFIRE-1019] - TestNG provider fails to execute JUnit4 tests
    * [SUREFIRE-1020] - Incorrect XML escape in <system-out> and <system-err> content of junit xml report

** Improvement
    * [SUREFIRE-1021] - New ParallelComputer options

** Task
    * [SUREFIRE-1013] - Fix typo, forkCount instead of forkMode on fork options examples page

** Bug
    * [SUREFIRE-829] - junit | Support inheritance while running test cases belonging to a particular category/group
    * [SUREFIRE-938] - out of memory when logging more messages than heap size
    * [SUREFIRE-944] - Surefire does not execute tests on abstract classes that contain static nested classes
    * [SUREFIRE-951] - Better handling of file.encoding system property
    * [SUREFIRE-969] - Log line on screen output
    * [SUREFIRE-973] - add properties to classpathDependencyExcludes and additionalClasspathElements parameters
    * [SUREFIRE-985] - Some Parameterized tests are not executed (or not reported)
    * [SUREFIRE-989] - Maven Failsafe Web-Site (Documentation) is not usable / not deployed
    * [SUREFIRE-990] - NPE When using maven-failsafe-plugin in parallel mode with cucumber-jvm
    * [SUREFIRE-991] - NPE when all tests are done with failsafe (parallel=classes) and cucumber-jvm
    * [SUREFIRE-992] - Surefire trims too much stack, with trimStackTrace=true
    * [SUREFIRE-996] - <system-out> and <system-err> content of junit xml report are not escaped
    * [SUREFIRE-998] - Problems with Umlauts in <system-out> (and probably <system-err>) content of junit xml report.
    * [SUREFIRE-999] - Skip phase `validate` during site-generation for `report-only` resp. `failsafe-report-only`

** Improvement
    * [SUREFIRE-968] - Test summary line does not indicate what was being run when using concurrency
    * [SUREFIRE-1002] - Simplify classloader structure

** New Feature
    * [SUREFIRE-569] - There should be a way to run unit tests from a dependency jar.

** Bug
    * [SUREFIRE-943] - Failing tests in TEST-*.xml file contain currupt information
    * [SUREFIRE-946] - Maven hangs on SIGTERM when using Surefire forking (CommandLineUtils.ProcessHook)
    * [SUREFIRE-947] - perCoreThreadCount ineffective
    * [SUREFIRE-950] - ClassNotFoundException org.apache.xerces.parsers.SAXParser not found
    * [SUREFIRE-953] - Multi-module build succeeds even if tests time out
    * [SUREFIRE-957] - XML report with Junit 4.7 or 4.11 does not include method names
    * [SUREFIRE-958] - Maven Surefire Web Page
    * [SUREFIRE-962] - SmartStackTraceParser cannot handle manipulated stack traces gracefully

** Improvement
    * [SUREFIRE-956] - Let ${surefire.forkNumber} deliver unique values when used in parallel mvn builds

** New Feature
    * [SUREFIRE-949] - Create forkCount parameter