GCP-Guest-Environment: redirect sv check to /dev/null

Avoid spamming the tty/serial with sv messages.
The stdout for this command is not needed as it is used programmatically with the exit status

srcpkgs/GCP-Guest-Environment/files/GCP-accounts/run

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-sv check GCP-Guest-Initialization || exit 1
+sv check GCP-Guest-Initialization >/dev/null || exit 1
 
 while ! ping -c1 metadata.google.internal >/dev/null ; do
     sleep 5

srcpkgs/GCP-Guest-Environment/files/GCP-clock-skew/run

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-sv check GCP-Guest-Initialization || exit 1
+sv check GCP-Guest-Initialization >/dev/null || exit 1
 
 while ! ping -c1 metadata.google.internal >/dev/null ; do
     sleep 5

srcpkgs/GCP-Guest-Environment/files/GCP-ip-forwarding/run

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-sv check GCP-Guest-Initialization || exit 1
+sv check GCP-Guest-Initialization >/dev/null || exit 1
 
 while ! ping -c1 metadata.google.internal >/dev/null ; do
     sleep 5

srcpkgs/GCP-Guest-Environment/template

@@ -1,7 +1,7 @@
 # Template file for 'GCP-Guest-Environment'
 pkgname=GCP-Guest-Environment
 version=20190801
-revision=1
+revision=2
 archs=noarch
 wrksrc="compute-image-packages-${version}"
 build_wrksrc="packages/python-google-compute-engine"