src/lib/dhcp/iface_mgr.*
    IfaceMgr::isSocketReceviedTimeSupported() - new function

src/lib/dhcp/pkt_filter.*
    PktFilter::isSocketReceviedTimeSupported() - new  pure virtual function

src/lib/dhcp/pkt_filter6.cc
src/lib/dhcp/pkt_filter_bpf.h
src/lib/dhcp/pkt_filter_inet.h
src/lib/dhcp/pkt_filter_inet6.h
src/lib/dhcp/pkt_filter_lpf.h
    Added implementation of isSocketReceivedTimeSupported()

src/lib/dhcp/pkt_filter_lpf.cc
    Removed WITH_CMSG and refactored receive() to be a single function
    with conditional codde based on SO_TIMESTAMP

Updated UTs accordingly