Skip iostreams tests on linux due to spurious failures

4 jobs for master in 11 minutes and 25 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
failed #1113
linux docker
build:linux64

00:11:24

passed #1111
windows autobuild
build:windows

00:03:51

passed #1112
windows autobuild
build:windows64

00:03:52

 
  Deploy
skipped #1114
windows autobuild allowed to fail manual
deploy:nexus
 
Name Stage Failure
failed
build:linux64 Build
Using shell: /bin/sh -c
argv[0] = '/bin/sh'
argv[1] = '-c'
argv[2] = '
echo passed > "bin.v2/libs/system/test/single_instance_test.test/gcc-8/debug/link-static/threading-multi/visibility-hidden/single_instance_test.test"
'
**passed** bin.v2/libs/system/test/single_instance_test.test/gcc-8/debug/link-static/threading-multi/visibility-hidden/single_instance_test.test

echo passed > "bin.v2/libs/system/test
Job's log exceeded limit of 4194304 bytes.