mysql-common: improve error message

[XingWei-Liu]

hi , there are situations when MySQL fails to start and the error is sent to standard error/standard out and is not display on the terminal. then i add some log message in ocf_exit_reason . hope it helps

[knet-jenkins[bot]]

Can one of the admins check and authorise this run please: https://ci.kronosnet.org/job/resource-agents/job/resource-agents-pipeline/job/PR-1887/1/input

[knet-jenkins[bot]]

Can one of the admins check and authorise this run please: https://ci.kronosnet.org/job/resource-agents/job/resource-agents-pipeline/job/PR-1887/5/input

[knet-jenkins[bot]]

Can one of the admins check and authorise this run please: https://ci.kronosnet.org/job/resource-agents/job/resource-agents-pipeline/job/PR-1887/6/input

[oalbrigt]

Thanks.