tooling: Limit Conan installation to <2.0

Short term solution until all tools and conanfiles are Conan 2.0
compatible.

Author: Franco Guidi

Makefile.setup

@@ -128,7 +128,7 @@ install-python-deps::
 	command -v ${PIP} >/dev/null 2>&1
 	${PIP} install ${PIP_INSTALL_ARGS} \
 		click \
-		conan \
+		"conan<2.0.0" \
 		libtmux \
 		toml \
 		pipx \

README.md

@@ -55,7 +55,7 @@ point. In a pinch, the following steps should suffice:
 
  1. Install Conan with Python.
     ```
-    pip3 install --user --upgrade conan
+    pip3 install --user --upgrade "conan<2.0.0"
     ```
  2. Define a Conan profile, which defines the machine configuration.
     ```

docs/install.rst

@@ -30,7 +30,7 @@ point. In a pinch, the following steps should suffice:
 1. `Install Conan <https://docs.conan.io/en/latest/installation.html>`__,
    if you haven't done so already; for example with `pip`_ or `pipx`_::
 
-      pipx install conan
+      pipx install "conan<2.0.0"
 
    .. note::
       We expect you to keep your Conan installation up-to-date. Since Conan is

optional/vtd/vendor/vtd/Dockerfile

@@ -138,7 +138,7 @@ RUN --mount=type=cache,id=bionic-cache,target=/var/cache/apt \
     rm -rf /var/lib/apt/lists/*
 
 RUN pip3 install --upgrade pip && \
-    pip3 install conan
+    pip3 install "conan<2.0.0"
 
 RUN conan profile new --detect default && \
     conan profile update settings.compiler.libcxx=libstdc++11 default