prereqs: Stop depending on python2

This removes all traces of python2 from the install list, and migrates all of
the packages we previously had in the python2 list to python3 and installs all
of them with pip3.

Change-Id: I3d5896fb07531c5317bd7acb46419b460b4da6af

install-prereqs.sh

diff --git a/install-prereqs.sh b/install-prereqs.sh
index a920904..cd2206b 100755
--- a/install-prereqs.sh
+++ b/install-prereqs.sh
@@ -63,7 +63,6 @@
     perl
     protobuf-compiler
     pv
-    python-dev
     python3-protobuf
     python3
     python3-dev
@@ -85,28 +84,25 @@
     zlib1g-dev
 )
 
-PYTHON_PACKAGES=(
+PYTHON3_PACKAGES=(
     camkes-deps
-    sel4-deps
-    setuptools
-    robotframework==4.0.1
-    netifaces
-    pandas
-    psutil
-    pyyaml
     hjson
     mako
     matplotlib
+    meson==0.54.0
+    netifaces
+    pandas
+    psutil
+    pyfzf
+    pyyaml
     requests
+    robotframework==4.0.1
+    sel4-deps
+    setuptools
     tempita
     wget
 )
 
-PYTHON3_PACKAGES=(
-    meson==0.54.0
-    pyfzf
-)
-
 function die {
     [[ ! -z "$@" ]] && echo "$@"
     exit 1
@@ -140,11 +136,6 @@
         die
     fi
 
-    for package in "${PYTHON_PACKAGES[@]}"; do
-        try pip install "${package}"
-        try pip3 install "${package}"
-    done
-
     for package in "${PYTHON3_PACKAGES[@]}"; do
         try pip3 install "${package}"
     done