Profiling tool : Update readSchema string parser

[nartal1]

This fixes a bug where the readSchema in the eventlog has some characters before the string "...".
Example:
If the eventlog has an entry of trimmed string of node such as:

name_26:string,name_30:string,name_27:string,name_31:string,m...

And the ReadSchema is:

name_26:string,name_30:string,name_27:string,name_31:string,name_29:string,name_24:string,name_28:string,name_35:string,name_33:string,name_32:string,name_34:string,name_36:string,name_41:bigint,name_39:bigint,totalmatchscore:bigint,name_42:bigint,name_38:bigint,name_40:bigint,name_52:bigint

This PR trims all the characters from the last comma until "..."

[parthosa]

Thanks @nartal1. LGTM.