Change to use memory_tracker variable

peakmem_tracker was deprected and replaced by
memory_tracker [0], use that variable instead.

[0] https://review.opendev.org/#/c/434470/

Also disabled since it's not clear if we need it, and
it's currently causing a job failure because of a missing
library.

Change-Id: I4f30bba1f2e0e4565df3fa2436c0713272ee2b88
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index 8462374..3e1c9f6 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -299,6 +299,7 @@
           g-api: true
           g-reg: true
           key: true
+          memory_tracker: false
           mysql: true
           n-api: true
           n-api-meta: true
@@ -314,7 +315,6 @@
           o-cw: true
           o-hm: true
           o-hk: true
-          peakmem_tracker: true
           placement-api: true
           q-agt: true
           q-dhcp: true