Merge #15352: tests: Reduce noise level in test_bitcoin output

0aef39d067 Silence "Test case [...] did not check any assertions" warnings when running "test_bitcoin --log_level=test_suite" (practicalswift)
5fd73c8694 Avoid repeated log messages in tests by connecting to signal handlers (ThreadSafeMessageBox, etc.) only once (practicalswift)
e502c3c515 tests: Reduce noise level in test_bitcoin output (practicalswift)

Pull request description:

  Reduce noise level in `test_bitcoin` output.

  Context: When working on the non-determinism issues in the unit tests (see #15296) I got a bit tired of the amount of noise in the `test_bitcoin` output :-)

  Before:

  ```
  $ src/test/test_bitcoin --log_level=test_suite 2>&1 | grep -vE '(Entering|Leaving)' | uniq -c
        1 Running 341 test cases...
        1 Test case blockencodings_tests/TransactionsRequestDeserializationOverflowTest did not check any assertions
        1 CheckSplitTorReplyLine(PROTOCOLINFO PIVERSION)
        1 CheckSplitTorReplyLine(AUTH METHODS=COOKIE,SAFECOOKIE COOKIEFILE="/home/x/.tor/control_auth_cookie")
        1 CheckSplitTorReplyLine(AUTH METHODS=NULL)
        1 CheckSplitTorReplyLine(AUTH METHODS=HASHEDPASSWORD)
        1 CheckSplitTorReplyLine(VERSION Tor="0.2.9.8 (git-a0df013ea241b026)")
        1 CheckSplitTorReplyLine(AUTHCHALLENGE SERVERHASH=aaaa SERVERNONCE=bbbb)
        1 CheckSplitTorReplyLine(COMMAND)
        1 CheckSplitTorReplyLine(COMMAND SOME  ARGS)
        1 CheckSplitTorReplyLine(COMMAND  ARGS)
        1 CheckSplitTorReplyLine(COMMAND   EVEN+more  ARGS)
        1 CheckParseTorReplyMapping(METHODS=COOKIE,SAFECOOKIE COOKIEFILE="/home/x/.tor/control_auth_cookie")
        1 CheckParseTorReplyMapping(METHODS=NULL)
        1 CheckParseTorReplyMapping(METHODS=HASHEDPASSWORD)
        1 CheckParseTorReplyMapping(Tor="0.2.9.8 (git-a0df013ea241b026)")
        1 CheckParseTorReplyMapping(SERVERHASH=aaaa SERVERNONCE=bbbb)
        1 CheckParseTorReplyMapping(ServiceID=exampleonion1234)
        1 CheckParseTorReplyMapping(PrivateKey=RSA1024:BLOB)
        1 CheckParseTorReplyMapping(ClientAuth=bob:BLOB)
        1 CheckParseTorReplyMapping(Foo=Bar=Baz Spam=Eggs)
        1 CheckParseTorReplyMapping(Foo="Bar=Baz")
        1 CheckParseTorReplyMapping(Foo="Bar Baz")
        1 CheckParseTorReplyMapping(Foo="Bar\ Baz")
        1 CheckParseTorReplyMapping(Foo="Bar\Baz")
        1 CheckParseTorReplyMapping(Foo="Bar\@Baz")
        1 CheckParseTorReplyMapping(Foo="Bar\"Baz" Spam="\"Eggs\"")
        1 CheckParseTorReplyMapping(Foo="Bar\\Baz")
        1 CheckParseTorReplyMapping(Foo="Bar\nBaz\t" Spam="\rEggs" Octals="\1a\11\17\18\81\377\378\400\2222" Final=Check)
        1 CheckParseTorReplyMapping(Valid=Mapping Escaped="Escape\\")
        1 CheckParseTorReplyMapping(Valid=Mapping Bare="Escape\")
        1 CheckParseTorReplyMapping(OneOctal="OneEnd\1" TwoOctal="TwoEnd\11")
        1 CheckParseTorReplyMapping(Null="\0")
        1 CheckParseTorReplyMapping(SOME=args,here MORE optional=arguments  here)
        1 CheckParseTorReplyMapping(ARGS)
        1 CheckParseTorReplyMapping(MORE ARGS)
        1 CheckParseTorReplyMapping(MORE  ARGS)
        1 CheckParseTorReplyMapping(EVEN more=ARGS)
        1 CheckParseTorReplyMapping(EVEN+more ARGS)
        1 Test case util_tests/util_criticalsection did not check any assertions
        1 Testing known outcomes
      326 Error: Specified -walletdir "/tmp/test_bitcoin/1553850209_943311758/tempdir/path_does_not_exist" does not exist
      327 Error: Specified -walletdir "/tmp/test_bitcoin/1553850209_643733972/tempdir/not_a_directory.dat" is not a directory
      328 Error: Specified -walletdir "wallets" is a relative path
        1
        1 *** No errors detected

  ```

  After:

  ```
  $ src/test/test_bitcoin --log_level=test_suite 2>&1 | grep -vE '(Entering|Leaving)' | uniq -c
        1 Running 341 test cases...
        1 Error: Specified -walletdir "/tmp/test_bitcoin/1553850026_943311758/tempdir/path_does_not_exist" does not exist
        1 Error: Specified -walletdir "/tmp/test_bitcoin/1553850026_643733972/tempdir/not_a_directory.dat" is not a directory
        1 Error: Specified -walletdir "wallets" is a relative path
        1
        1 *** No errors detected

  ```

ACKs for commit 0aef39:
  MarcoFalke:
    utACK 0aef39d0678ec2f26633028d44eea0ba0087e7c0

Tree-SHA512: 9cc22f64aa5c875861bae6533d18675ad978c623f053754deef6a8e271ea70bda3f72fb4ec5c8fd19b841757f21380639051d5f5b44301b9d2464b57655e9c05

0 files changed, 0 insertions, 0 deletions