1. In the client, check the return code on wolfSSL_CTX_SetMinDhKey_Sz() as it is checked in the server. (Resolves issue #2037.)
2. In HashOutput(), check that the hsHashes exists for the session before hashing. (Resolves issue #2038.)
Fixed a potential bug with respect to processing fragmented handshake
messages. If a handshake message is fragmented across multiple TLS
records and the last fragment's record has the next handshake message in
it, we would throw a buffer error instead of processing the next
message. Changed this so it will finish the handshake message and return
out to process the next message. Also changed the handling of the
handshake message to follow the calling pattern.
* Added support for running as only Client (`-c`) or Server (`-s`).
* Added support for using sockets (in addition to in memory mode `-m`).
* Fixed support for 16KB test packet (memory version needed TLS header space). Changed to default to 16KB.
* Fixed so transfer is done on each connection and there is not transfer limit (instead "shutdown" message is used).
* Made pthread support optional and based on HAVE_PTHREAD.
* Tested non-blocking support with sockets or shared memory.
To use with localhost sockets and threading use `./examples/benchmark/tls_bench`
To use with threading and in-memory use `./examples/benchmark/tls_bench -m`
To use as separate server client applications with localhost sockets use: `./examples/benchmark/tls_bench -s` and `./examples/benchmark/tls_bench -c` in separate terminals.
```
./examples/benchmark/tls_bench -?
tls_bench 3.15.7 NOTE: All files relative to wolfSSL home dir
-? Help, print this usage
-c Run as client only, no threading and uses sockets
-s Run as server only, no threading and uses sockets
-h Host (default localhost)
-P Port (default 11112)
-e List Every cipher suite available
-i Show peer info
-l <str> Cipher suite list (: delimited)
-t <num> Time <num> (seconds) to run each test (default 1)
-p <num> The packet size <num> in bytes [1-16kB] (default 16384)
-v Show verbose output
-d Enable debug messages
-T <num> Number of threaded server/client pairs (default 1)
-m Use local memory, not socket
```
