Minor update to test_server for finding old releases

This is valid internal in OTP test environment only

Links starting with 'otp_beam_linux_' are removed.
ssl: Fixes ssl_crl_SUITE errors on mixed ipv6-v4 interfaces
ssl: TLSv1.2: proper default sign algo for RSA
ssl: always pass negotiated version when selecting hashsign

Negotiated version is now always passed to ssl_handshake:select_hashsign
because ssl_handshake:select_cert_hashsign has different rsa defaults on
tlsv1.2 and older versions.
Merge branch 'maint'
Update kernel, stdlib and sasl appup tests

Add test of update instructions from current major to current
minor. Earlier only previous major to current was tested.
Update crashdump_viewer_SUITE with new release numbers

After bumping to Erlang/OTP 18, R15 dumps can no longer be
created. Now we test dumps from R16B and 17.
ssl: Refactor so that there is only one source for the default hashsign values

Also fix DTLS call to supply its corresponding TLS version
ssl: Fix crash on garbage during handshake

If a client sends some garbage in ssl record instead of
valid fragment, server crashes with function_clause while
receiving next record from client.
This patch makes server raise handshake failure instead of
crashing and exposing internal state to user code.
Document that spawn_opt/5 does not support the 'monitor' option
Merge branch 'hans/ssl/ssl_crl_SUITE/win_connect_failure'

* hans/ssl/ssl_crl_SUITE/win_connect_failure:
  ssl: Fixes ssl_crl_SUITE errors on mixed ipv6-v4 interfaces
Merge branch 'ia/pr/340' into maint

* ia/pr/340:
  ssl: Refactor so that there is only one source for the default hashsign values
  ssl: always pass negotiated version when selecting hashsign
  ssl: TLSv1.2: proper default sign algo for RSA
Merge branch 'ia/pr/339' into maint

* ia/pr/339:
  ssl: Fix crash on garbage during handshake
Merge remote-tracking branch 'upstream/maint'
mnesia: Handle failed net_loads better

In case of a failed net load and no more available copies,
remove the table from late_load_queue, otherwise tables
can not be forced loaded.
ssl: Remove outdated documentation
Merge branch 'ia/ssl/remove-otdated-doc' into maint

* ia/ssl/remove-otdated-doc:
  ssl: Remove outdated documentation
Merge remote-tracking branch 'upstream/maint'
ssl: Fixes ssl_crl_SUITE errors on mixed ipv6-v4 interfaces
Merge branch 'hans/ssl/ssl_crl_SUITE/win_connect_failure_b' into maint