Avoid using deprecated GREP_COLOR

NEWS.rst

@@ -2,6 +2,11 @@
 History
 =======
 
+21.2.3
+------
+
+run_tests: Avoid using deprecated grep environment variable.
+
 21.2.2
 ------
 

run_tests

@@ -128,7 +128,7 @@
     echo -e "${GREEN}Passes${RESET}:"
 
     # Highlight the "OK"s in green (32).
-    GREP_COLOR='0;32' grep --color=always ' OK' $logfile || true
+    GREP_COLORS='mt=0;32' grep --color=always ' OK' $logfile || true
 fi
 
 if [[ $failed -gt 0 ]];
@@ -136,7 +136,7 @@
     echo -e "${RED}Failures${RESET}:"
 
     # Highlight the failure matches in red (31).
-    GREP_COLOR='0;31' grep --color=always "CRITICAL\|FAIL\(ED\|:\)" $logfile
-    GREP_COLOR='0;31' grep --color=always "ERROR [^ ]* openerp\.tools\.yaml_import:" $logfile
-    GREP_COLOR='0;31' grep --color=always "ERROR [^ ]* openerp.modules.module: Can not \`import openerp\.addons\..*\`" $logfile
+    GREP_COLORS='mt=0;31' grep --color=always "CRITICAL\|FAIL\(ED\|:\)" $logfile
+    GREP_COLORS='mt=0;31' grep --color=always "ERROR [^ ]* openerp\.tools\.yaml_import:" $logfile
+    GREP_COLORS='mt=0;31' grep --color=always "ERROR [^ ]* openerp.modules.module: Can not \`import openerp\.addons\..*\`" $logfile
     # this one is for odoo 7
@@ -142,3 +142,3 @@
     # this one is for odoo 7
-    GREP_COLOR='0;31' grep --color=always "TEST .* ERROR:" $logfile
+    GREP_COLORS='mt=0;31' grep --color=always "TEST .* ERROR:" $logfile
     # this one is for odoo 13 for tests that produces errors (failures are matched with FAIL: )
@@ -144,6 +144,6 @@
     # this one is for odoo 13 for tests that produces errors (failures are matched with FAIL: )
-    GREP_COLOR='0;31' grep --color=always "ERROR \([[:alnum:]]\|_\)* .\+\.test_.\+ ERROR:" $logfile
-    GREP_COLOR='0;31' grep --color=always "invalid module names, ignored" $logfile
+    GREP_COLORS='mt=0;31' grep --color=always "ERROR \([[:alnum:]]\|_\)* .\+\.test_.\+ ERROR:" $logfile
+    GREP_COLORS='mt=0;31' grep --color=always "invalid module names, ignored" $logfile
     if [[ -n "$import_errors" ]];
     then
         echo "$import_errors"