Add FUNCTION FLUSH command to flush all functions (#9936)

Added `FUNCTION FLUSH` command. The new sub-command allows delete all the functions.
An optional `[SYNC|ASYNC]` argument can be given to control whether or not to flush the
functions synchronously or asynchronously. if not given the default flush mode is chosen by
`lazyfree-lazy-user-flush` configuration values.

Add the missing `functions.tcl` test to the list of tests that are executed in test_helper.tcl,
and call FUNCTION FLUSH in between servers in external mode

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/support/server.tcl b/tests/support/server.tcl
index 4c63d7b3a..ee39c8df9 100644
--- a/tests/support/server.tcl
+++ b/tests/support/server.tcl
@@ -343,6 +343,7 @@ proc run_external_server_test {code overrides} {
     }
 
     r flushall
+    r function flush
 
     # store overrides
     set saved_config {}