test Mercury experimental patch nightly

- also switch to startup allocation on lcrc for now

perf-regression/bebop/margo-regression.sbatch

 #!/bin/bash
 #SBATCH -N 2
-#SBATCH -A radix
+#SBATCH -A startup-carns
 #SBATCH --ntasks-per-node=1
 #SBATCH --time=15:00
 #SBATCH -p bdwall

perf-regression/bebop/run-regression.sh

@@ -16,6 +16,7 @@ JOBDIR=$PWD/mochi-regression-job-$$
 
 # scratch area to clone and build things
 mkdir -p $SANDBOX
+cp spack-mercury-exp.patch  $SANDBOX/
 cp packages.yaml $SANDBOX/
 
 # scratch area for job submission
@@ -32,6 +33,8 @@ git clone https://github.com/pdlfs/mercury-runner.git
 
 # set up most of the libraries in spack
 echo "=== BUILD SPACK PACKAGES AND LOAD ==="
+cd $SANDBOX/sds-repo
+patch -p1 < ../spack-mercury-exp.patch
 cd $SANDBOX/spack
 . $SANDBOX/spack/share/spack/setup-env.sh
 # put packages file in place in SPACK_ROOT to set our preferences for building

perf-regression/bebop/spack-mercury-exp.patch

+diff --git a/packages/mercury/package.py b/packages/mercury/package.py
+index 1cbe73c..898ed29 100644
+--- a/packages/mercury/package.py
++++ b/packages/mercury/package.py
+@@ -32,7 +32,7 @@ class Mercury(CMakePackage):
+     url = "https://mercury-hpc.github.io/"
+ 
+ 
+-    version('master', git='https://github.com/mercury-hpc/mercury.git',
++    version('master', branch='carns/dev-ofi-config-matrix', git='https://github.com/carns/mercury.git',
+             submodules=True)
+ 
+     variant('cci', default=False, description="Use CCI for network transport")