CI: Make use of buildman requirements.txt

Now that buildman has a requirements.txt file we need to make use of it.

Reviewed-by: Simon Glass <sjg@chromium.org>
[n-francis@ti.com: Adding missing command from .azure-pipelines.yml]
Signed-off-by: Neha Malcom Francis <n-francis@ti.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/.azure-pipelines.yml b/.azure-pipelines.yml
index b7dc7e8..ef7711d 100644
--- a/.azure-pipelines.yml
+++ b/.azure-pipelines.yml
@@ -162,6 +162,7 @@
           virtualenv -p /usr/bin/python3 /tmp/venv
           . /tmp/venv/bin/activate
           pip install -r test/py/requirements.txt
+          pip install -r tools/buildman/requirements.txt
           export UBOOT_TRAVIS_BUILD_DIR=/tmp/sandbox_spl
           export PYTHONPATH=${UBOOT_TRAVIS_BUILD_DIR}/scripts/dtc/pylibfdt
           export PATH=${UBOOT_TRAVIS_BUILD_DIR}/scripts/dtc:${PATH}
@@ -209,6 +210,7 @@
           git config --global --add safe.directory $(work_dir)
           export USER=azure
           pip install -r test/py/requirements.txt
+          pip install -r tools/buildman/requirements.txt
           pip install asteval pylint==2.12.2 pyopenssl
           export PATH=${PATH}:~/.local/bin
           echo "[MASTER]" >> .pylintrc
@@ -404,6 +406,7 @@
           if [ -n "${BUILD_ENV}" ]; then
               export ${BUILD_ENV};
           fi
+          pip install -r tools/buildman/requirements.txt
           tools/buildman/buildman -o ${UBOOT_TRAVIS_BUILD_DIR} -w -E -W -e --board ${TEST_PY_BD} ${OVERRIDE}
           cp ~/grub_x86.efi ${UBOOT_TRAVIS_BUILD_DIR}/
           cp ~/grub_x64.efi ${UBOOT_TRAVIS_BUILD_DIR}/
@@ -584,6 +587,7 @@
           # make environment variables available as tests are running inside a container
           export BUILDMAN="${BUILDMAN}"
           git config --global --add safe.directory ${WORK_DIR}
+          pip install -r tools/buildman/requirements.txt
           EOF
           cat << "EOF" >> build.sh
           if [[ "${BUILDMAN}" != "" ]]; then