netkit-rsh: add two patches and some fixes.

* Update the checksum of the license text to include all the
license text to instead of the previous only from two to
three line.
* Customize compile option such as CFLAGS= -D_GNU_SOURCE
and the specific install folder.
* Customize pam configuration file for rsh, rexec.
and rlogin to make them work.
* Update the line "server  = /usr/bin/tcpd" to
"server = /usr/sbin/tcpd" for /etc/xinetd.d/{rexec,rlogin,rsh}.
* Fix some typo such as replace RPROVIDES_${PN}-rshd = "rshd"
to RPROVIDES_${PN}-server = "rshd"
* Fix host variable when rsh is renamed to other.
* Add rexec to support ipv6.

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>