The following changes were done within this worklog:
  * Extended format of a value for the bind-addressi, mysqlx-bind-address and
    admin-address options to allow specifying a network namespace that be used
    for listening incoming connections for corresponding interface addresses.
  * Added handling of network namespace on socket creation and IP address
    to host name resolving.
  * Extended a grammar of the statement CHANGE MASTER TO in order to support
    the clause NETWORK_NAMESPACE=string_value. This clause is used for
    specifying of a network namespace that a replication master uses for
    listening connection requests from a replication slave.
  * Provided storing of a network namespace in the table slave_master_info.
  * The error code ER_WILDCARD_NOT_ALLOWED_FOR_MULTIADDRESS_BIND was added
    to be output in case wildcard value specified for multi address
    --bind-address option value. It was done to be uniform with
    ER_NETWORK_NAMESPACE_NOT_ALLOWED_FOR_WILDCARD_ADDRESS that used for
    similar use case for network namespaces.
  * The error code ER_NETWORK_NAMESPACES_NOT_SUPPORTED was added to report
    error condition when a network namespace is specified on a platform
    that doesn't support network namespace feature.
  * The error code ER_UNKNOWN_NETWORK_NAMESPACE was added to report error
    condition when a specified network namespace is not configured
    on a host
  * The error code ER_SETNS_FAILED was added to report error condition
    that attempt to switch on a some network namespace failed.

Reviewed-by: Thayumanavar Sachithanantham <thayumanavar.x.sachithanantha@oracle.com>