Add tests for building *-minimal images

Lets make sure these images can be built.

Change-Id: Idbd07b98c0181738d002a53373425e056390beea

elements/centos-minimal/test-elements/build-succeeds/README.rst

@@ -0,0 +1 @@
+Verify we can build a centos-minimal image.

elements/fedora-minimal/test-elements/build-succeeds/README.rst

@@ -0,0 +1 @@
+Verify we can build a fedora-minimal image.

elements/fedora-minimal/test-elements/build-succeeds/environment.d/10-fedora-pin-mirror.bash

@@ -0,0 +1,2 @@
+# Pin to this mirror because the roundrobin is fairly unreliable
+export DIB_DISTRIBUTION_MIRROR=http://dl.fedoraproject.org/pub/fedora/linux

elements/ubuntu-minimal/test-elements/build-succeeds/README.rst

@@ -0,0 +1 @@
+Verify we can build a ubuntu-minimal image.

tests/install_test_deps.sh

@@ -11,8 +11,11 @@ sudo apt-get install -y --force-yes \
         inetutils-ping \
         lsb-release \
         kpartx \
+        python-lzma \
         qemu-utils \
-        uuid-runtime || \
+        rpm \
+        uuid-runtime \
+        yum-utils || \
     sudo yum -y install \
         debootstrap \
         docker \
@@ -22,4 +25,6 @@ sudo apt-get install -y --force-yes \
         app-emulation/qemu \
         dev-python/pyyaml \
         sys-block/parted \
-        sys-fs/multipath-tools
+        sys-fs/multipath-tools \
+        qemu-img \
+        yum-utils

tests/run_functests.sh

@@ -21,6 +21,8 @@ DEFAULT_SKIP_TESTS=(
     # good to have the test case around - but because of changes
     # in testing does not work always.
     debian-minimal/testing-build-succeeds
+    # Currently failing due to bug in locale generation
+    centos-minimal/build-succeeds
 )
 
 # run_disk_element_test <test_element> <element>