Metamer: add wainting for input elem. when set attribute value
RFPL-2720: Metamer: fix request events testing routine

Since there is reload (attribute value submit) triggered automatically when sendKeys performed, it is required wait for resh page in other way than just wait HTTP request on explicit page submit call (it is ok to ensure it is submitted, but this even should be preceeded by automatic submit)
Metamer: update @sincei (replace @version) for groupPanelMenu tests