8170544: Fix code scan findings in libnet
Reviewed-by: goetz, chegar

8167295: Further cleanup to the native parts of libnet/libnio
Reviewed-by: chegar

6432031: Add support for SO_REUSEPORT
Reviewed-by: alanb, simonis, chegar
Contributed-by: yingqi.lu@intel.com

8132652: Java_sun_nio_ch_Net_poll passes a long to an int
Summary: Clamp long timeout parameter to [-1,INT_MAX].
Reviewed-by: alanb

8132505: Signature of Java_sun_nio_ch_Net_socket0 should return jint not int
Summary: Change return type of Java_sun_nio_ch_Net_socket0 from int to jint
Reviewed-by: alanb

8060170: Support SIO_LOOPBACK_FAST_PATH option on Windows
Reviewed-by: alanb
Contributed-by: kirk.shoop@microsoft.com, v-valkop@microsoft.com

8055955: (ch) Remove unnecessary initialization of InetAddress from FileChannel
Reviewed-by: alanb

8054834: Modular Source Code
Reviewed-by: alanb, chegar, ihse, mduigou
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, magnus.ihse.bursie@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, paul.sandoz@oracle.com