Improve tramp-compat-connection-local-p

* lisp/net/tramp-compat.el (tramp-compat-connection-local-p):
Make it compatible with Emacs 27.
10 jobs for master in 3 minutes and 13 seconds (queued for 7 seconds)
Status Job ID Name Coverage
  Build Images
failed #78396
build-image-inotify

00:03:13

 
  Normal
skipped #78397
test-all-inotify
 
  Platform Images
failed #78398
build-image-eglot

00:03:08

failed #78400
build-image-gnustep

00:03:06

failed #78399
build-image-tree-sitter

00:03:09

 
  Platforms
skipped #78401
test-eglot
skipped #78403
test-gnustep
skipped #78402
test-tree-sitter
 
  Native Comp Images
failed #78404
build-native-comp-speed2

00:03:02

 
  Native Comp
skipped #78405
test-native-comp-speed2
 
Name Stage Failure
failed
build-image-tree-sitter Platform Images
 > [internal] load build context:
------
rpc error: code = Canceled desc = grpc: the client connection is closing
Running after script...
$ test -n "$(docker ps -aq -f name=${test_name})" && docker cp ${test_name}:checkout/test ${test_name}
$ test -n "$(docker ps -aq -f name=${test_name})" && docker rm ${test_name}
find: build-image-tree-sitter-33aa46fe: No such file or directory
$ find ${test_name} ! \( -name "*.log" -o -name ${EMACS_TEST_JUNIT_REPORT} \) -type f -delete
ERROR: Job failed: exit code 1
failed
build-image-inotify Build Images
 > [internal] load build context:
------
rpc error: code = Unavailable desc = transport is closing
Running after script...
$ test -n "$(docker ps -aq -f name=${test_name})" && docker cp ${test_name}:checkout/test ${test_name}
$ test -n "$(docker ps -aq -f name=${test_name})" && docker rm ${test_name}
$ find ${test_name} ! \( -name "*.log" -o -name ${EMACS_TEST_JUNIT_REPORT} \) -type f -delete
find: build-image-inotify-33aa46fe: No such file or directory
ERROR: Job failed: exit code 1
failed
build-image-gnustep Platform Images
rpc error: code = Unavailable desc = transport is closing
Running after_script
Running after script...
$ test -n "$(docker ps -aq -f name=${test_name})" && docker cp ${test_name}:checkout/test ${test_name}
$ test -n "$(docker ps -aq -f name=${test_name})" && docker rm ${test_name}
$ find ${test_name} ! \( -name "*.log" -o -name ${EMACS_TEST_JUNIT_REPORT} \) -type f -delete
find: build-image-gnustep-33aa46fe: No such file or directory
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1

failed
build-native-comp-speed2 Native Comp Images
 > [internal] load build context:
------
rpc error: code = Unavailable desc = transport is closing
Running after script...
$ test -n "$(docker ps -aq -f name=${test_name})" && docker cp ${test_name}:checkout/test ${test_name}
$ test -n "$(docker ps -aq -f name=${test_name})" && docker rm ${test_name}
$ find ${test_name} ! \( -name "*.log" -o -name ${EMACS_TEST_JUNIT_REPORT} \) -type f -delete
find: build-native-comp-speed2-33aa46fe: No such file or directory
ERROR: Job failed: exit code 1
failed
build-image-eglot Platform Images
rpc error: code = Canceled desc = grpc: the client connection is closing
Running after_script
Running after script...
$ test -n "$(docker ps -aq -f name=${test_name})" && docker cp ${test_name}:checkout/test ${test_name}
$ test -n "$(docker ps -aq -f name=${test_name})" && docker rm ${test_name}
$ find ${test_name} ! \( -name "*.log" -o -name ${EMACS_TEST_JUNIT_REPORT} \) -type f -delete
find: build-image-eglot-33aa46fe: No such file or directory
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1