gdbserver_tests/filter_gdb filter out 'entry value'.

Some versions of gdb might try to print the entry value of an
argument if they know it with @entry=... Filter that out too.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14380 a5019735-40e9-0310-863c-91ae7b9d1cf9
gdbserver_tests filter out and don't expect empty lines.

Some filters might have left some empty lines in the output.  Filter them
out explicitly and don't expect any empty lines in any of the .exp files.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14381 a5019735-40e9-0310-863c-91ae7b9d1cf9