Further tweak esxi deployment support

Try removing the exec, as memory seems
constrained in exec case for some reason.

Specify behavior when dealing with existing
vmfs.

confluent_osdeploy/esxi7/initramfs/bin/dcuiweasel

@@ -24,4 +24,4 @@ chmod +x /tmp/makeksnet
 rootpw=$(grep ^rootpassword: /etc/confluent/confluent.deploycfg|sed -e 's/^rootpassword: //')
 echo rootpw --iscrypted $rootpw > /tmp/rootuser
 export BOOT_CMDLINE=ks=/etc/confluent/ks.cfg
-exec /bin/install
+/bin/install

confluent_osdeploy/esxi7/profiles/hypervisor/kickstart

@@ -1,5 +1,5 @@
 accepteula
-install --firstdisk
+install --firstdisk --preservevmfs
 %include /tmp/ksnet
 %include /tmp/rootuser
 reboot