clean up the test suite

by removing test wrappers that are no longer used and renaming a helper
file that had a name starting with the "test_" prefix

tests/p2p/all_tests.nim

@@ -1,4 +0,0 @@
-import
-  testecies, testauth, testcrypt, tshh,
-  les/test_flow_control
-

tests/rlp/all.nim

@@ -1,3 +0,0 @@
-import
-  test_api_usage, test_object_serialization, test_json_suite
-

tests/trie/all.nim

@@ -1,8 +0,0 @@
-import
-  test_binaries_utils, test_bin_trie,
-  test_branches_utils, examples,
-  test_hexary_trie, test_json_suite,
-  test_sparse_binary_trie,
-  test_storage_backends,
-  test_caching_db_backend
-

tests/trie/test_bin_trie.nim

@@ -1,7 +1,7 @@
 import
   unittest, random,
   eth/trie/[trie_defs, db, binary],
-  test_utils
+  ./testutils
 
 suite "binary trie":
 

tests/trie/test_binaries_utils.nim

@@ -2,7 +2,7 @@ import
   unittest, strutils,
   ranges/bitranges, eth/rlp/types, nimcrypto/[keccak, hash],
   eth/trie/[binaries, trie_utils],
-  test_utils
+  ./testutils
 
 proc parseBitVector(x: string): BitRange =
   result = genBitVec(x.len)

tests/trie/test_hexary_trie.nim

@@ -1,7 +1,7 @@
 import
   unittest, strutils, sequtils, os,
   ranges/typedranges, eth/trie/[hexary, db, trie_defs], nimcrypto/utils,
-  test_utils, algorithm, eth/rlp/types as rlpTypes, random
+  ./testutils, algorithm, eth/rlp/types as rlpTypes, random
 
 template put(t: HexaryTrie|SecureHexaryTrie, key, val: string) =
   t.put(key.toBytesRange, val.toBytesRange)

tests/trie/test_json_suite.nim

@@ -2,7 +2,7 @@ import
   os, json, tables, sequtils, strutils, algorithm,
   eth/rlp/types, nimcrypto/utils,
   eth/trie/[trie_defs, db, hexary],
-  test_utils
+  ./testutils
 
 proc `==`(lhs: JsonNode, rhs: string): bool =
   lhs.kind == JString and lhs.str == rhs

tests/trie/test_sparse_binary_trie.nim

@@ -1,7 +1,7 @@
 import
   unittest, random,
   eth/trie/[trie_defs, db, sparse_binary, sparse_proofs],
-  test_utils
+  ./testutils
 
 suite "sparse binary trie":
   randomize()