Improved portability of tests

Removed assumptions about umask and locale. Fixed hostname
tests to work even when the host has no DNS domain set.

Signed-off-by: Dan Fandrich <dan@coneharvesters.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

testsuite/cpio.tests

@@ -4,6 +4,8 @@
 
 . ./testing.sh
 
+umask 022
+
 # ls -ln shows date. Need to remove that, it's variable.
 # sed: coalesce spaces
 # cut: remove date