Remove unnecessary grep and tr from some tests

Change-Id: I1cd911ee35614f1726dd95abe6a5b1923a8b772c
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/robot-systest/lib/openstack_lib.robot b/robot-systest/lib/openstack_lib.robot
index bdf49aa..19dddc9 100644
--- a/robot-systest/lib/openstack_lib.robot
+++ b/robot-systest/lib/openstack_lib.robot
@@ -196,7 +196,7 @@
     [Arguments]   ${flavor_name}   ${cpu}=1   ${ram}=1024   ${disk}=10
 
     Should Not Be Empty   ${flavor_name}
-    ${rc}   ${flavor_id}=   Run and Return RC and Output   openstack flavor create ${flavor_name} --ram ${ram} --disk ${disk} --vcpus ${cpu} -f yaml | yq '.id' | tr -d \\"
+    ${rc}   ${flavor_id}=   Run and Return RC and Output   openstack flavor create ${flavor_name} --ram ${ram} --disk ${disk} --vcpus ${cpu} -f yaml | yq -r '.id'
     Log   ${flavor_id}
     Should Be Equal As Integers   ${rc}   ${success_return_code}
     [Return]   ${flavor_id}