Add static-passwd and static-group files

In order to pass reproducible tests, recipes that use the
useradd class must have static ids configured.

Signed-off-by: Fabien Thomas <fabien.thomas@smile.fr>
Reviewed-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-webserver/files/static-passwd-meta-webserver

@@ -0,0 +1,2 @@
+www:x:690:nogroup::/:/bin/nologin
+netdata:x:691:nogroup::/:/bin/nologin