Restore remote test and fix bug

[eisenhauer]

Or avoid bug. EVPath doesn't like 8-byte messages. Add junk so that it's 16.

[anagainaru]

Looks good otherwise

[anagainaru]

I would add in the comment the reason why you are adding this

[eisenhauer]

done

[eisenhauer]

Summary of changes:

• For the moment, disable memory sanitization in two routines in remote_server. Not sure yet if msan is confused by something there or if there's a real problem, but lets get the other things in.
• Actually test the success of various server operations and raise appropriate client-side exceptions when things fail.
• freopen server stderr to file /tmp/server_stderr. This is invaluable for getting sanitizer output for the server when it is run in the background as a ctest fixture.
• there's an adiosNetwork fix to handle odd hostname setups in some VMs and dockers images
• Change simpleFile memory management to rely upon shared_ptr.
• Add a "-d filename" option to adios2_remote_server. This is useful in fixture shutdown and causes a file to be dumped to stdout. This can at least get a server log or other file into the raw log from CI.

[eisenhauer]

Changed logging method to avoid std::cout and introduce a log_output() subroutine that uses a lock for mutual exclusion. Previous msan errors were really tsan issues with multiple threads having conflicts on the internal IO buffers.