packaging: Added hint to demo server to MacOS installer
packaging: Added changed FUSE check to osxfuse in MacOS installer
tanja-erasurecodes/tests: Updated .gitgnore.
tanja-erasurecodes/interface: Updated .gitgnore.
foundation: Fixed bug that a view buffer of a non-reusable buffer was
created as reusable buffer. Now the view buffer will also be a
non-reusable buffer.

Added unit test to reproduce the problem.

Moved ReusableBufferTest class to new package which does not have
".test." in its name.
foundation: Created unit test for BufferPool class.

Added getPoolSize(int) to BufferPool class for unit tests.
servers: SetupUtils: Fixed path to default SSL certificates.
servers: Added example which uses libxtreemfs for Java with the default
SSL certificates to read and write a 1 MB file.
foundation: BufferPool unit test: Fixed a typo which I forgot to include
in a previous commit.
servers: OSD: HashStorageLayout: Fixed typo in comment.
client: VolumeImplementation unit test: Fixed indentation.
foundation: RPCNIOSocketServer: When binding the server socket fails
with a BindException, rethrow it with the failed port number.

This will simplify to find the ports which cannot be reused during the
nightly JUnit test runs.
servers: libxtreemfs for Java: Fixed problem that synchronous RPC calls
did not wait between two attemps to execute the request.

A result of the problem was that retry attempts were exhausted very fast
e.g., when the server refused the connection.

This commit adds a simple Thread.sleep() which waits
options.getRetryDelay_s(). An advanced version could take the time
already elapsed into account (like the C++ client does).
client: helper.cpp: Fixed wrong comment where the word "stripe" was
used, but "chunk" was meant.
client: helper.cpp: Removed trailing whitespace.
client: Implemented multi-homing support in C++ libxtreemfs for Linux.

If multiple addresses for the same UUID are available, the first address
which matches a locally available network will be preferred.

In helper.cpp a new method "GetNetworks()" was introduced which
enumerates the available network interfaces.

Added corresponding unit test helper_test.cpp for the new method.

Added unit test client_implementation_test.cpp which tests the correct
functioning of the multi-homing support.
client: Unit Tests: Shutdown protobuf library at exit (necessary if
tests do not call the ClientImplementation destructor.)
client: FuseOptions unit test: Fixed memory leak (found by Valgrind).
client: UUIDIterator unit test: Fixed Valgrind error "Conditional jump
or move depends on uninitialised value(s)" caused by loop which iterated
beyond an array.
client: AsyncWriteHandler unit test: Fixed Valgrind error "Use of
uninitialised or unaddressable values in system calls" due to write
buffers which were not initialized.
client: FileHandleImplementation: Fixed memory leak during truncate().

Found by Valgrind when running the object_cache unit test.