Fix some connect options to work with embedded.

Disable in --embedded tests that rely on connecting to mysqld externally by
spawning mysqltest.

Disable in --embedded tests that rely on the mysqltest --list_files command,
which does not seem to work properly in --embedded.

mysql-test/suite/parts/t/partition_alter1_1_2_innodb.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_alter1_1_2_myisam.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_alter1_1_innodb.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_alter1_1_myisam.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_alter1_2_innodb.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_alter1_2_myisam.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_alter2_1_innodb.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_alter2_1_maria.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_alter2_1_myisam.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_alter2_2_innodb.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_alter2_2_maria.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_alter2_2_myisam.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_alter3_innodb.test:
  Disable in --embedded tests that rely on the mysqltest --list_files command,
  which does not seem to work properly in --embedded.
mysql-test/suite/parts/t/partition_alter3_myisam.test:
  Disable in --embedded tests that rely on the mysqltest --list_files command,
  which does not seem to work properly in --embedded.
mysql-test/suite/parts/t/partition_alter4_innodb.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_alter4_myisam.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_basic_innodb.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_basic_myisam.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_basic_symlink_myisam.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_engine_innodb.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_engine_myisam.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_special_innodb.test:
  Fix some connect options to work with embedded.
mysql-test/suite/parts/t/partition_syntax_innodb.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.
mysql-test/suite/parts/t/partition_syntax_myisam.test:
  Disable in --embedded tests that rely on connecting to mysqld externally by
  spawning mysqltest.