Be consistent about 𝑥_tests.txt

Some files were named 𝑥_test.txt and some 𝑥_tests.txt. This change
unifies around the latter.

Change-Id: Id6f29bad8b998f3c3466655097ef593f7f18f82f
Reviewed-on: https://boringssl-review.googlesource.com/8150
Reviewed-by: David Benjamin <davidben@google.com>

crypto/cipher/test/aes_128_gcm_tests.txt

@@ -1,4 +1,4 @@
-# The AES-128-GCM test cases from cipher_test.txt have been merged into this
+# The AES-128-GCM test cases from cipher_tests.txt have been merged into this
 # file.
 
 KEY: d480429666d48b400633921c5407d1d1

crypto/cipher/test/aes_256_gcm_tests.txt

@@ -1,4 +1,4 @@
-# The AES-256-GCM test cases from cipher_test.txt have been merged into this
+# The AES-256-GCM test cases from cipher_tests.txt have been merged into this
 # file.
 
 KEY: e5ac4a32c67e425ac4b143c83c6f161312a97d88d634afdf9f4da5bd35223f01

util/all_tests.json

@@ -30,7 +30,7 @@
 	["crypto/cipher/aead_test", "des-ede3-cbc-sha1-ssl3", "crypto/cipher/test/des_ede3_cbc_sha1_ssl3_tests.txt"],
 	["crypto/cipher/aead_test", "aes-128-ctr-hmac-sha256", "crypto/cipher/test/aes_128_ctr_hmac_sha256.txt"],
 	["crypto/cipher/aead_test", "aes-256-ctr-hmac-sha256", "crypto/cipher/test/aes_256_ctr_hmac_sha256.txt"],
-	["crypto/cipher/cipher_test", "crypto/cipher/test/cipher_test.txt"],
+	["crypto/cipher/cipher_test", "crypto/cipher/test/cipher_tests.txt"],
 	["crypto/cmac/cmac_test"],
 	["crypto/constant_time_test"],
 	["crypto/curve25519/ed25519_test", "crypto/curve25519/ed25519_tests.txt"],
@@ -52,11 +52,11 @@
 	["crypto/modes/gcm_test"],
 	["crypto/newhope/newhope_test"],
 	["crypto/newhope/newhope_statistical_test"],
-	["crypto/newhope/newhope_vectors_test", "crypto/newhope/newhope_test.txt"],
+	["crypto/newhope/newhope_vectors_test", "crypto/newhope/newhope_tests.txt"],
 	["crypto/obj/obj_test"],
 	["crypto/pkcs8/pkcs12_test"],
 	["crypto/pkcs8/pkcs8_test"],
-	["crypto/poly1305/poly1305_test", "crypto/poly1305/poly1305_test.txt"],
+	["crypto/poly1305/poly1305_test", "crypto/poly1305/poly1305_tests.txt"],
 	["crypto/refcount_test"],
 	["crypto/rsa/rsa_test"],
 	["crypto/thread_test"],