Added core18 snap path to PATH.

This should fix the issue where the configure hook doesn't run
properly on systems without netcat installed.

Also got rid of call to install netcat in tools/install_and_build.sh.

Doubled timeout in .zuul.yaml to deal with timeout that happened
during this test (I think that we were pushing the hour timeout as it was).

Change-Id: Ie9cd729109a871c32c12108163d22008d91155f9

.zuul.yaml

@@ -1,7 +1,7 @@
 - job:
     name: microstack-tox-snap-with-sudo
     parent: openstack-tox-snap-with-sudo
-    timeout: 3600
+    timeout: 7200
     nodeset: ubuntu-bionic
 
 - project:

snapcraft.yaml

@@ -9,7 +9,7 @@ grade: stable
 confinement: classic
 environment:
   LD_LIBRARY_PATH: $SNAP/lib:$SNAP/lib/$SNAPCRAFT_ARCH_TRIPLET:$SNAP/usr/lib:$SNAP/usr/lib/$SNAPCRAFT_ARCH_TRIPLET
-  PATH: $SNAP/usr/sbin:$SNAP/usr/bin:$SNAP/sbin:$SNAP/bin:$PATH
+  PATH: $SNAP/usr/sbin:$SNAP/usr/bin:$SNAP/sbin:$SNAP/bin:/snap/core18/current/bin:$PATH
   LC_ALL: C
   OS_PLACEMENT_CONFIG_DIR: $SNAP/etc/nova/
   # admin rc (TODO: put this someplace more sensible)

tools/install_and_build.sh

@@ -4,8 +4,6 @@ set -ex
 
 export PATH=/snap/bin:$PATH
 
-which nc || sudo apt install -y netcat
-
 sudo apt update
 sudo apt install -y snapd