Add support for copy/add with multiple src files

Part one of solution for issue #6820

Signed-off-by: Doug Davis <dug@us.ibm.com>
Merge pull request #8076 from duglin/MultiCopyAdd

Add support for copy/add with multiple src files
Use prefix naming for docker_cli_run_test.go

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Use prefix naming for events test

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Use prefix naming for inspect tests

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Use prefix naming for attach tests

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Use prefix naming for build tests

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Use prefix naming for create tests

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Use prefix naming for links tests

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Use prefix naming for port tests

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Use prefix naming for ps tests

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Use prefix naming for restart tests

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Use prefix naming for rm tests

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Use prefix naming for rmi tests

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>