autotest: Reduce required inodes for veyron_rialto

Change the number of required inodes for the stateful partition from
100k to 55k for veyron_rialto, which has a small disk size.

Also, moved similar existing variables from shadow configs to global
config for consistency.

TEST=None
BUG=chrome-os-partner:45875

Change-Id: If5594aec28e65b75fd3378c6c9016040ea287804
Reviewed-on: https://chromium-review.googlesource.com/304323
Reviewed-by: Alexandru Stan <amstan@chromium.org>
Reviewed-by: Dan Shi <dshi@chromium.org>
Commit-Queue: Paul Hobbs <phobbs@google.com>
Tested-by: Paul Hobbs <phobbs@google.com>
diff --git a/global_config.ini b/global_config.ini
index 4bddc63..a92a87b 100644
--- a/global_config.ini
+++ b/global_config.ini
@@ -115,6 +115,13 @@
 gb_diskspace_required: 0.7
 # Minmum number of i-nodes for stateful, in 1000 i-node units.
 kilo_inodes_required: 100
+# Rialto has a small disk size, so reduce the required inodes for it.
+# See https://code.google.com/p/chrome-os-partner/issues/detail?q=45875
+kilo_inodes_required_veyron_rialto: 55
+kilo_inodes_required_arkham: 50
+kilo_inodes_required_storm: 50
+kilo_inodes_required_whirlwind: 50
+
 # Minimum amount of disk space required for encrypted stateful partition in GB
 gb_encrypted_diskspace_required: 0.1
 # If for some reason you don't want to rely on the Mail Transport Agent