matrix - disable error checks for activate; add additional dependency psycopg2

seqs/matrix.sh

@@ -97,10 +97,12 @@ step_4() {
   exe mkdir -p "$MATRIX_HOME"
   exe virtualenv -p python3 "${MATRIX_HOME}/env"
   exe cd "$MATRIX_HOME"
+  disableErrorCheck
   exe source "${MATRIX_HOME}/env/bin/activate"
+  enableErrorCheck
   exe pip install --upgrade pip
   exe pip install --upgrade setuptools
-  exe pip install matrix-synapse[postgres] lxml
+  exe pip install matrix-synapse[postgres] lxml psycopg2
 }
 
 step_5_info() { echo "Create default configuration and folder structure"; }