schema parsers BUGFIX do not change working directory forever
schema parsers BUGFIX do not change working directory forever

When the working directory is changed for seaching schema in searchdir,
we have to go back to the original working directory. The change was
intended, but not performed by mistake.

Fixes #126

PavolVican/libyang,PavolVican/libyang,PavolVican/libyang,lukasmacko/libyang,lukasmacko/libyang,PavolVican/libyang,PavolVican/libyang