Added new definitions in omrportsock.h to be used by users

- The users will use the constants defined here for function
  calls in omrsock_addrinfo_create_hints and omrsock_socket,
  and so on.
- More defined constants will be added here in the future.

Issue: eclipse-omr#4795

Co-authored-by: Babneet Singh <sbabneet@ca.ibm.com>
Co-authored-by: Robert Young <rwy0717@gmail.com>

Signed-off-by: Haley Cao <haleycao88@hotmail.com>

Added os dependent constants for mapping OMRSOCK constants

- These constants will be mapped to the OMRSOCK constants,
  which the users will use.
- These constants are not used by the users and will be hidden
  from the users.
- There will be internal mapping functions inside omrsock.c
  to map the two constants so that these constants are hidden
  from users.

Issue: eclipse-omr#4795

Co-authored-by: Babneet Singh <sbabneet@ca.ibm.com>
Co-authored-by: Robert Young <rwy0717@gmail.com>

Signed-off-by: Haley Cao <haleycao88@hotmail.com>

Added constants mapping for implementing omrsock_socket

- These constants are mapping OMR user interface constants
  to OS dependent constants, which will be needed by the
  system socket function to create a socket.
- These are added for isolating the users from the system
  constants.
- Functions needing to convert OMR to OS constants includes
  omrsock_getaddrinfo_create_hints and omrsock_socket

Issue: eclipse-omr#4795

Co-authored-by: Babneet Singh <sbabneet@ca.ibm.com>
Co-authored-by: Robert Young <rwy0717@gmail.com>

Signed-off-by: Haley Cao <haleycao88@hotmail.com>

Added constants mapping for implementing omrsock_socket

- These are for mapping OS dependent constants to OMR user
  interface.
- Thse are added to isolate users from system constants.
- Functing neeting this converting includes omrsock_getaddrinfo_family,
  omrsock_getaddrinfo_socktype, omrsock_getaddrinfo_protocol.

Issue: eclipse-omr#4795

Co-authored-by: Babneet Singh <sbabneet@ca.ibm.com>
Co-authored-by: Robert Young <rwy0717@gmail.com>

Signed-off-by: Haley Cao <haleycao88@hotmail.com>

Fixed unix/omrsock.c to accept constants defined

- Changed omrsock_getaddrinfo_create_hints so that it now
  accepts OMR defined constants and changes it to OS
  dependent constants.
- Changed omrsock_getaddrinfo_family, sockType, and protocol
  to map to and return OMR defined constants.

Issue: eclipse-omr#4795

Co-authored-by: Babneet Singh <sbabneet@ca.ibm.com>
Co-authored-by: Robert Young <rwy0717@gmail.com>

Signed-off-by: Haley Cao <haleycao88@hotmail.com>

Change the family, socktype, protocols to defined constants

- Changed both test cases to accept and test new constants in
  test cases.

Issue: eclipse-omr#4795

Signed-off-by: Haley Cao <haleycao88@hotmail.com>