check_mysql.c: Detect running mysqldump

When checking a slave, if the IO Thread or the SQL Thread are stopped, check for running mysqldump threads, return STATE_OK if there is any.
Requires PROCESS privilege to work (else the mysqldump thread(s) would not be detected).

Enlarged SLAVERESULTSIZE to fit "Mysqldump: in progress" at the end of the string.
Got a NULL pointer in row[seconds_behind_field] instead of the "NULL" string when a mysqldump is running [mysql 5.7.34 + libmariadb3 10.3.31], so added a check for that.

0 files changed, 0 insertions, 0 deletions