Keep forcing python3 for 'pylustrequota' build

Author: Martin-Rehr

Dockerfile.rocky8

@@ -1704,7 +1704,7 @@ RUN if [ "${ENABLE_QUOTA}" = "True" ] \
             && cd ${MIG_ROOT}/mig/src/pylustrequota/lustre-release/lustre/utils \
             && make liblustreapi.la \
             && cd ${MIG_ROOT}/mig/src/pylustrequota \
-            && python -m pip install --use-pep517 . \
+            && python3 -m pip install --use-pep517 . \
             && rm -rf ${MIG_ROOT}/mig/src/pylustrequota/lustre-release; \
         fi; \
     fi;

Dockerfile.rocky9

@@ -1591,7 +1591,7 @@ RUN if [ "${ENABLE_QUOTA}" = "True" ] \
             && cd ${MIG_ROOT}/mig/src/pylustrequota/lustre-release/lustre/utils \
             && make liblustreapi.la \
             && cd ${MIG_ROOT}/mig/src/pylustrequota \
-            && python -m pip install --use-pep517 . \
+            && python3 -m pip install --use-pep517 . \
             && rm -rf ${MIG_ROOT}/mig/src/pylustrequota/lustre-release; \
         fi; \
     fi;