Install mercurial and version-control-tools in the HTTP service tests task too

.taskcluster.yml

@@ -125,10 +125,13 @@ tasks:
             - "-lcx"
             - "apt-get -qq update &&
                apt-get -qq install -y python-pip &&
+               pip install --disable-pip-version-check --quiet --no-cache-dir mercurial==5.3 &&
+               hg clone -r ce06125e4728 https://hg.mozilla.org/hgcustom/version-control-tools /version-control-tools/ &&
                git clone --quiet ${repository} &&
                curl -L https://github.com/mozilla/rust-code-analysis/releases/download/v0.0.8/rust-code-analysis-linux-x86_64.tar.gz | tar -C /usr/bin -xzv --strip=1 && chmod +x /usr/bin/rust-code-analysis &&
                cd bugbug &&
                git -c advice.detachedHead=false checkout ${head_rev} &&
+               cp infra/hgrc /etc/mercurial/hgrc.d/bugbug.rc &&
                pip install --disable-pip-version-check --quiet --no-cache-dir . &&
                pip install --disable-pip-version-check --quiet --no-cache-dir -r test-requirements.txt &&
                pip install --disable-pip-version-check --quiet --no-cache-dir ./http_service &&