message: [Code Style] Remove std namespace in test file
diff: #include "hash.h"
  #include "random.h"
  -using namespace std;
  -
  class CAddrManTest : public CAddrMan
  {
  uint64_t state;
  @@ -378,7 +376,7 @@ BOOST_AUTO_TEST_CASE(addrman_getaddr)
  int octet1 = i % 256;
  int octet2 = (i / 256) % 256;
  int octet3 = (i / (256 * 2)) % 256;
  - string strAddr = boost::to_string(octet1) + "." + boost::to_string(octet2) + "." + boost::to_string(octet3) + ".23";
  + std::string strAddr = boost::to_string(octet1) + "." + boost::to_string(octet2) + "." + boost::to_string(octet3) + ".23";
  CAddress addr = CAddress(CService(strAddr));
  // Ensure that for all addrs in addrman, isTerrible == false.
  @@ -387,7 +385,7 @@ BOOST_AUTO_TEST_CASE(addrman_getaddr)
  if (i % 8 == 0)
  addrman.Good(addr);
  }
  - vector<CAddress> vAddr = addrman.GetAddr();
  + std::vector<CAddress> vAddr = addrman.GetAddr();
  size_t percent23 = (addrman.size() * 23) / 100;
  BOOST_CHECK(vAddr.size() == percent23);
  @@ -429,7 +427,7 @@ BOOST_AUTO_TEST_CASE(caddrinfo_get_tried_bucket)
  BOOST_CHECK(info1.GetKey() != info2.GetKey());
  BOOST_CHECK(info1.GetTriedBucket(nKey1) != info2.GetTriedBucket(nKey1));
  - set<int> buckets;
  + std::set<int> buckets;
  for (int i = 0; i < 255; i++) {
  CAddrInfo infoi = CAddrInfo(
  CAddress(CService("250.1.1." + boost::to_string(i))),
  @@ -482,7 +480,7 @@ BOOST_AUTO_TEST_CASE(caddrinfo_get_new_bucket)
  BOOST_CHECK(info1.GetKey() != info2.GetKey());
  BOOST_CHECK(info1.GetNewBucket(nKey1) == info2.GetNewBucket(nKey1));
  - set<int> buckets;
  + std::set<int> buckets;
  for (int i = 0; i < 255; i++) {
  CAddrInfo infoi = CAddrInfo(
  CAddress(CService("250.1.1." + boost::to_string(i))),
  