[Mellanox] Add all results from saisdkdump to the techsupport on Mellanox switches (sonic-net#1660)

- What I did
Enhance the way techsupport collects dumps provided by SAI and do not keep them in the filesystem once the techsupport is created.

- How I did it
Create a temporary directory once techsupport script is executed, gather all files SAI dumps created, add them to the tech support and remove the temporary directory and files.
Remove direct call to FW trace collection as it is done now by SAI dump

- How to verify it
Run techsupport, verify newly created files are part of it including mlxtrace which is no longer called directly by the techsupport script.

Author: DavidZagury

scripts/generate_dump

@@ -758,10 +758,20 @@ enable_logrotate() {
 #  None
 ###############################################################################
 collect_mellanox() {
-    local sai_dump_filename="/tmp/sai_sdk_dump_$(date +"%m_%d_%Y_%I_%M_%p")"
+    local sai_dump_folder="/tmp/saisdkdump"
+    local sai_dump_filename="${sai_dump_folder}/sai_sdk_dump_$(date +"%m_%d_%Y_%I_%M_%p")"
+
+    ${CMD_PREFIX}docker exec -it syncd mkdir -p $sai_dump_folder
     ${CMD_PREFIX}docker exec -it syncd saisdkdump -f $sai_dump_filename
-    ${CMD_PREFIX}docker exec syncd tar Ccf $(dirname $sai_dump_filename) - $(basename $sai_dump_filename) | tar Cxf /tmp/ -
-    save_file $sai_dump_filename sai_sdk_dump true
+
+    copy_from_docker syncd $sai_dump_folder $sai_dump_folder
+    echo "$sai_dump_folder"
+    for file in `ls $sai_dump_folder`; do
+        save_file ${sai_dump_folder}/${file} sai_sdk_dump true 
+    done
+
+    ${CMD_PREFIX}rm -rf $sai_dump_folder
+    ${CMD_PREFIX}docker exec -it syncd rm -rf $sai_dump_folder
 
     local mst_dump_filename="/tmp/mstdump"
     local max_dump_count="3"