Compilation failure with gtest and --with-werror

There are two compilation warnings in src/lib/dhcpsrv that, together with werror enabled, cause the compilation to fail.

host_mgr_unittest.cc:508:1: error: ‘void {anonymous}::HostMgrTest::testGetAllbyHostnameSubnet6(isc::dhcp::BaseHostDataSource&, isc::dhcp::BaseHostDataSource&)’ defined but not used

  virtual Lease4Collection getLeases4(const std::string& hostname) const``` (repeated for both v4 and v6)

Edited Nov 26, 2019 by Tomek Mrugalski

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