Add devstack plugin

This is initial commit of ironic-staging-drivers devstack plugin.
The plugin install ironic-staging-drivers and adds drivers specified
in devstack/enabled-drivers.txt to Ironic enabled_drivers.

It install driver specific requirements by walking through list of
staging drivers directories and calls:
  pip_install -r $driver/python-requirements.txt
  source $driver/other-requirements.sh

Directories specified in IRONIC_DRIVERS_EXCLUDED_DIRS are ignored.

List of enabled ironic drivers:
 fake_wol_fake, pxe_wol_iscsi, pxe_wol_agent,
 agent_ipmitool_nm, fake_nm,
 pxe_libvirt_agent, pxe_libvirt_iscsi, fake_libvirt_fake

Moves libvirt requirements to libvirt/python-requirements.txt

amt driver requires openwsman library, and will be added in next CR.

Change-Id: I281118b6e4bf17c98717d7727f99e61db418ba20

devstack/enabled-drivers.txt

@@ -0,0 +1,8 @@
+fake_wol_fake
+pxe_wol_iscsi
+pxe_wol_agent
+agent_ipmitool_nm
+fake_nm
+pxe_libvirt_agent
+pxe_libvirt_iscsi
+fake_libvirt_fake

devstack/plugin.sh

@@ -0,0 +1,64 @@
+#!/bin/bash
+# plugin.sh - devstack plugin for ironic-staging-drivers
+
+IRONIC_STAGING_DRIVERS_DIR=$DEST/ironic-staging-drivers
+IRONIC_DRIVERS_EXCLUDED_DIRS='tests common'
+
+
+function update_ironic_enabled_drivers {
+    local saveIFS
+    saveIFS=$IFS
+    IFS=","
+    while read driver; do
+        if [[ ! $IRONIC_ENABLED_DRIVERS =~ $(echo "\<$driver\>") ]]; then
+           if [[ -z "$IRONIC_ENABLED_DRIVERS" ]]; then
+               IRONIC_ENABLED_DRIVERS="$driver"
+           else
+               IRONIC_ENABLED_DRIVERS+=",$driver"
+           fi
+        fi
+    done < $IRONIC_STAGING_DRIVERS_DIR/devstack/enabled-drivers.txt
+    IFS=$saveIFS
+    # NOTE(vsaienko) if ironic-staging-drivers are called after ironic
+    # setting IRONIC_ENABLED_DRIVERS will not take affect. Update ironic
+    # configuration explicitly.
+    iniset $IRONIC_CONF_FILE DEFAULT enabled_drivers "$IRONIC_ENABLED_DRIVERS"
+}
+
+function install_ironic_staging_drivers {
+    setup_develop $IRONIC_STAGING_DRIVERS_DIR
+}
+
+function install_drivers_dependencies {
+    local p_deps
+    local o_deps
+    for path in $IRONIC_STAGING_DRIVERS_DIR/ironic_staging_drivers/*; do
+        driver=$(basename $path)
+        if [[ -d $path && ! "$IRONIC_DRIVERS_EXCLUDED_DIRS" =~ "$driver" ]]; then
+            p_deps=${IRONIC_STAGING_DRIVERS_DIR}/ironic_staging_drivers/${driver}/python-requirements.txt
+            o_deps=${IRONIC_STAGING_DRIVERS_DIR}/ironic_staging_drivers/${driver}/other-requirements.sh
+            if [[ -f "$p_deps" ]]; then
+               echo_summary "Installing $driver python dependencies"
+               pip_install -r $p_deps
+            fi
+            if [[ -f "$o_deps" ]]; then
+               echo_summary "Installing $driver other dependencies"
+               source $o_deps
+            fi
+        fi
+    done
+}
+
+echo_summary "ironic-staging-drivers plugin.sh was called..."
+
+if is_service_enabled ir-api ir-cond; then
+    if [[ "$1" == "stack" && "$2" == "install" ]]; then
+        echo_summary "Installing Ironic-staging-drivers"
+        install_ironic_staging_drivers
+        install_drivers_dependencies
+
+    elif [[ "$1" == "stack" && "$2" == "post-config" ]]; then
+        echo_summary "Configuring Ironic-staging-drivers"
+        update_ironic_enabled_drivers
+    fi
+fi

driver-requirements.txt

@@ -1,6 +0,0 @@
-# This file lists all python libraries which are utilized by drivers,
-# and may not be listed in global-requirements.
-
-
-# libvirt driver requires libvirt-python library which is available on pypi
-libvirt-python>=1.2.5 # LGPLv2+

ironic_staging_drivers/libvirt/python-requirements.txt

@@ -0,0 +1 @@
+libvirt-python>=1.2.5 # LGPLv2+