message: [Trivial] Rename base test class in p2p_time_offset functional test
diff: import time
  -from test_framework.test_framework import BitcoinTestFramework
  +from test_framework.test_framework import PivxTestFramework
  from test_framework.util import (
  assert_equal,
  connect_nodes_bi,
  set_node_times
  )
  -class TimeOffsetTest(BitcoinTestFramework):
  +class TimeOffsetTest(PivxTestFramework):
  def set_test_params(self):
  self.setup_clean_chain = True
  self.num_nodes = 8
  