Update configure-apt-mock.sh to enable parallelism

This adds a few errors that happen when another update/install process is running in parallel. `apt-get update` doesn't handle race conditions well, and `apt-get install` has one as well.

This is pre-cursor to another change that enables parallelism in the packer templates to run the `install-*.sh` scripts parallel, as I mentioned in #2320

images/ubuntu/scripts/build/configure-apt-mock.sh

@@ -26,6 +26,15 @@ while [ \$i -le 30 ];do
   if grep -q 'Could not get lock' \$err;then
     # apt db locked needs retry
     retry=true
+  elif grep -q 'Could not get lock /var/lib/apt/lists/lock' \$err;then
+    # apt update did not complete (race condition), needs retry
+    retry=true
+  elif grep -q 'Problem renaming the file /var/cache/apt/pkgcache.bin.* to /var/cache/apt/pkgcache.bin' \$err;then
+    # apt-get did not complete (race condition), needs retry
+    retry=true
+  elif grep -q 'Problem renaming the file /var/cache/apt/srcpkgcache.bin.* to /var/cache/apt/srcpkgcache.bin' \$err;then
+    # apt update did not complete (race condition), needs retry
+    retry=true
   elif grep -q 'Could not open file /var/lib/apt/lists' \$err;then
     # apt update is not completed, needs retry
     retry=true