[YSQL] Nodes crash due to spaces in g-flag values during universe creation or g-flag upgrades

[shishir2001-yb]

Jira Link: DB-14149

Description

Version: 2.25.0.0 and any version before it

If a universe is created or g-flags are upgraded, and spaces are unintentionally included between two values of a g-flag, the nodes may crash with the following core dump. Ideally, this should be handled internally to prevent such issues.

The allowed_preview_flags_csv is provided here as an example, but this behavior could affect several other g-flags as well:

"allowed_preview_flags_csv":"ysql_yb_enable_ash, ysql_yb_ash_enable_infra"

                                                ^(This space)         

* thread #1, name = 'yb-tserver', stop reason = signal SIGABRT
  * frame #0: 0x00007f461ab40acf libc.so.6`raise + 271
    frame #1: 0x00007f461ab13ea5 libc.so.6`abort + 295
    frame #2: 0x0000558e50c058c9 yb-tserver`google::logging_fail() + 9
    frame #3: 0x0000558e50c055f4 yb-tserver`google::LogMessage::SendToLog() + 2612
    frame #4: 0x0000558e50c05cfd yb-tserver`google::LogMessage::Flush() + 221
    frame #5: 0x0000558e50c06349 yb-tserver`google::LogMessageFatal::~LogMessageFatal() + 9
    frame #6: 0x0000558e52775b1a yb-tserver`yb::ParseCommandLineFlags(argc=<unavailable>, argv=<unavailable>, remove_flags=true) at flags.cc:623:7
    frame #7: 0x0000558e5236abc8 yb-tserver`yb::MasterTServerParseFlagsAndInit(server_type="tserver", is_master=<unavailable>, argc=0x00007ffec4c1d5d0, argv=0x00007ffec4c1d2b8) at server_main_util.cc:146:3
    frame #8: 0x0000558e524ccbe8 yb-tserver`yb::tserver::TabletServerMain(argc=<unavailable>, argv=<unavailable>) at tablet_server_main_impl.cc:253:3
    frame #9: 0x0000558e50bb5154 yb-tserver`main(argc=3, argv=0x00007ffec4c1e518) at master_main.cc:184:12
    frame #10: 0x00007f461ab2cd85 libc.so.6`__libc_start_main + 229
    frame #11: 0x0000558e50a7c02e yb-tserver`_start + 46

Issue Type

kind/bug

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