[generate_dump] exclude mft and mlx folders from /etc (sonic-net#2072)

- What I did
Exclude mft and mlnx folders from /etc during execution generate_dump

- How I did it
Fix appropriate --exclude pattern in tar cmd execution (add * character )

- How to verify it
py.test show_techsupport/test_techsupport_no_secret.py --inventory="../ansible/inventory,../ansible/veos" --host-pattern (testbad) --module-path ../ansible/library/ --testbed (testbad)-(topo) --testbed_file ../ansible/testbed.csv --allow_recover --assert plain --log-cli-level info --show-capture=no -ra --showlocals -v --skip_sanity

Signed-off-by: Andriy Yurkiv <[email protected]>

Author: ayurkiv-nvda

scripts/generate_dump

@@ -1314,8 +1314,8 @@ main() {
         --exclude="*/etc/ssh*" \
         --exclude="*get_creds*" \
         --exclude="*snmpd.conf*" \
-        --exclude="/etc/mlnx" \
-        --exclude="/etc/mft" \
+        --exclude="*/etc/mlnx" \
+        --exclude="*/etc/mft" \
         --exclude="*/etc/sonic/*.cer" \
         --exclude="*/etc/sonic/*.crt" \
         --exclude="*/etc/sonic/*.pem" \