Add rust rpm provisioner to adm node (#2382)

* Add rust rpm provisioner to adm node

Building the rpms locally has been difficult becuase using the docker
container is significantly slower, even after increasing the available
ram and cpu's. In contrast, building in the adm vm appears to be nearly
as fast as building on the host. Furthermore, adding sccache appears to
maintain dependency builds across different branches, allowing for much
quicker builds. This patch adds a new provisioner to build the rust rpms
using the adm virtual machine and takes care of installing all necessary
dependencies, including sccache. To build the rust rpms, simply run the
following:

```
vagrant provision adm --provision-with build-rust-rpms
```

Signed-off-by: johnsonw <wjohnson@whamcloud.com>

* Don't delete the _topdir before invoking the make command

Signed-off-by: johnsonw <wjohnson@whamcloud.com>

* Move env vars into Makefile

Signed-off-by: johnsonw <wjohnson@whamcloud.com>

* Update release version between builds

Signed-off-by: johnsonw <wjohnson@whamcloud.com>

* Move environment variables from Makefile into the .bash_profile of the adm node and resource it before running make.

Signed-off-by: johnsonw <wjohnson@whamcloud.com>

* No need to edit the spec file. The dist can be passed as an environment variable to the Make environment

Signed-off-by: johnsonw <wjohnson@whamcloud.com>

vagrant/Vagrantfile

@@ -255,6 +255,11 @@ Vagrant.configure('2') do |config|
  type: 'shell',
  run: 'never',
  path: 'scripts/load-diagnostics-db.sh'
+
+ adm.vm.provision 'build-rust-rpms',
+ type: 'shell',
+ run: 'never',
+ path: 'scripts/build_rust_rpms.sh'
  end
 
  #

vagrant/scripts/build_rust_rpms.sh

@@ -0,0 +1,21 @@
+yum install -y openssl-devel
+yum install -y cargo rpm-build
+
+[ -f /root/.cargo/bin/sccache ] && echo "sccache already installed. Skipping." || cargo install sccache
+
+sed -i '/^export CARGO_HOME/d' /root/.bash_profile
+sed -i '/^export SCCACHE_CACHE_SIZE/d' /root/.bash_profile
+sed -i '/^export SCCACHE_DIR/d' /root/.bash_profile
+sed -i '/^export RUSTC_WRAPPER/d' /root/.bash_profile
+
+cat <<EOF >> /root/.bash_profile
+export CARGO_HOME=/root/.cargo
+export SCCACHE_CACHE_SIZE=40G
+export SCCACHE_DIR=/root/.cache
+export RUSTC_WRAPPER=/root/.cargo/bin/sccache
+EOF
+
+source /root/.bash_profile
+
+cd /integrated-manager-for-lustre \
+ && RPM_DIST=".$(date '+%s')" make copr-rpms