fix format specifiers in log messages in PrlApiCore.cpp

Log message are usually disabled, so nobody tried to
compile code with enabled log messages on linux.
These messages contain many errors in format specifiers.
fix log message in PveControl.cpp
fix format specifiers in log messages in PrlApiVm.cpp

Log message are usually disabled, so nobody tried to
compile code with enabled log messages on linux.
These messages contain many errors in format specifiers.