tempest: set compute-feature-enabled.volume_multiattach

This adds the ENABLE_VOLUME_MULTIATTACH flag and if True
configures Tempest to run volume multiattach tests.

Note that due to https://bugzilla.redhat.com/show_bug.cgi?id=1378242
we can't run multiattach tests with the Pike UCA packages since
those include qemu 2.10 and libvirt 3.6, and the valid versions for
multiattach support with libvirt is qemu<2.10 or libvirt>=3.10.

Depends-On: I80c20914c03d7371e798ca3567c37307a0d54aaa
Depends-On: I158c6f20e3e6a24bd2e5299abbeb3fc5208e5885

Part of nova blueprint multi-attach-volume

Change-Id: I46b7eabf6a28f230666f6933a087f73cb4408348

lib/tempest

@@ -382,6 +382,10 @@ function configure_tempest {
         fi
     fi
 
+    if [[ $ENABLE_VOLUME_MULTIATTACH == "True" ]]; then
+        iniset $TEMPEST_CONFIG compute-feature-enabled volume_multiattach True
+    fi
+
     if is_service_enabled n-novnc; then
         iniset $TEMPEST_CONFIG compute-feature-enabled vnc_console True
     fi

stackrc

@@ -601,6 +601,11 @@ NOVNC_BRANCH=${NOVNC_BRANCH:-stable/v0.6}
 SPICE_REPO=${SPICE_REPO:-http://anongit.freedesktop.org/git/spice/spice-html5.git}
 SPICE_BRANCH=${SPICE_BRANCH:-master}
 
+# Global flag used to configure Tempest and potentially other services if
+# volume multiattach is supported. In Queens, only the libvirt compute driver
+# and lvm volume driver support multiattach, and qemu must be less than 2.10
+# or libvirt must be greater than or equal to 3.10.
+ENABLE_VOLUME_MULTIATTACH=$(trueorfalse False ENABLE_VOLUME_MULTIATTACH)
 
 # Nova hypervisor configuration.  We default to libvirt with **kvm** but will
 # drop back to **qemu** if we are unable to load the kvm module.  ``stack.sh`` can
@@ -612,7 +617,12 @@ VIRT_DRIVER=${VIRT_DRIVER:-$DEFAULT_VIRT_DRIVER}
 case "$VIRT_DRIVER" in
     ironic|libvirt)
         LIBVIRT_TYPE=${LIBVIRT_TYPE:-kvm}
-        if [[ "$os_VENDOR" =~ (Debian|Ubuntu) ]]; then
+        # If ENABLE_VOLUME_MULTIATTACH is True, the Ubuntu Cloud Archive can't
+        # be used until it provides libvirt>=3.10, and with older versions of
+        # Ubuntu the group is "libvirtd".
+        # TODO(mriedem): Remove the ENABLE_VOLUME_MULTIATTACH check when
+        # UCA has libvirt>=3.10.
+        if [[ "$os_VENDOR" =~ (Debian|Ubuntu) && "${ENABLE_VOLUME_MULTIATTACH}" == "False" ]]; then
             # The groups change with newer libvirt. Older Ubuntu used
             # 'libvirtd', but now uses libvirt like Debian. Do a quick check
             # to see if libvirtd group already exists to handle grenade's case.

tools/fixup_stuff.sh

@@ -75,7 +75,12 @@ fi
 # Make it possible to switch this based on an environment variable as
 # libvirt 2.5.0 doesn't handle nested virtualization quite well and this
 # is required for the trove development environment.
-if [[ "${ENABLE_UBUNTU_CLOUD_ARCHIVE}" == "True" && "$DISTRO" = "xenial" ]]; then
+# The Pike UCA has qemu 2.10 but libvirt 3.6, therefore if
+# ENABLE_VOLUME_MULTIATTACH is True, we can't use the Pike UCA
+# because multiattach won't work with those package versions.
+# We can remove this check when the UCA has libvirt>=3.10.
+if [[ "${ENABLE_UBUNTU_CLOUD_ARCHIVE}" == "True" && "$DISTRO" = "xenial" && \
+        "${ENABLE_VOLUME_MULTIATTACH}" == "False" ]]; then
     # This pulls in apt-add-repository
     install_package "software-properties-common"
     # Use UCA for newer libvirt. Should give us libvirt 2.5.0.