LU-17186 utils: replace gethostby*() with get*info()

LU-17186 utils: replace gethostby*() with get*info()

This patch replaces the deprecated gethostbyname() and
gethostbyaddr() functions with getaddrinfo() and getnameinfo()
functions respectively.

The getaddrinfo() function combines the functionality provided by the
gethostbyname() and getservbyname() functions into a single interface,
but unlike the latter functions, getaddrinfo() is reentrant and allows
programs to eliminate IPv4-versus-IPv6 dependencies.

The getnameinfo() function is the inverse of getaddrinfo(): it
converts a socket address to a corresponding host and service, in a
protocol-independent manner. It combines the functionality of
gethostbyaddr() and getservbyport(), but unlike those functions,
getnameinfo() is reentrant and allows programs to eliminate
IPv4-versus-IPv6 dependencies.

Test-Parameters: kerberos=true testlist=sanity-krb5
Test-Parameters: testgroup=review-dne-selinux-ssk-part-2
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: Iacb5583826cd2f7329455bc6cbb4477f9087f15a