test/drb/test_drbssl.rb: skip LeakChecker as openssl keeps /dev/random
and /dev/urandom intentionally. OpenSSL::PKey::RSA.new opens the two
random generators and keeps the file descriptors.
93f99b681a/crypto/rand/rand_unix.c (L674)
They are detected by the LeakChecker as fd leak, but it is intentional.
http://rubyci.s3.amazonaws.com/graviton2/ruby-master/log/20200526T160005Z.log.html.gz
```
[ 597/20199] DRbTests::TestDRbSSLAry#test_01 = 0.29 s
Leaked file descriptor: DRbTests::TestDRbSSLAry#test_01: 8 #<File::Stat dev=0x6, ino=11, mode=020666, nlink=1, uid=0, gid=0, rdev=0x109, size=0, blksize=4096, blocks=0, atime=2020-05-23 14:45:13.751999995 +0000, mtime=2020-05-23 14:45:13.751999995 +0000, ctime=2020-05-23 14:45:13.751999995 +0000>
Leaked file descriptor: DRbTests::TestDRbSSLAry#test_01: 9 #<File::Stat dev=0x6, ino=10, mode=020666, nlink=1, uid=0, gid=0, rdev=0x108, size=0, blksize=4096, blocks=0, atime=2020-05-23 14:45:13.755999995 +0000, mtime=2020-05-23 14:45:13.755999995 +0000, ctime=2020-05-23 14:45:13.755999995 +0000>
```
962c302a1a