* src/hash.c, src/internal.h: Remove virGetDomainByID function
	  as it is not used or exported.
	* src/proxy_internal.c, src/qemu_driver.c, src/remote_internal.c,
	  src/test.c, src/xend_internal.c, src/xs_internal.c: Fix
	  all callers to virGetDomain and virGetNetwork functions -
	  the callers do not need to set virterror since it is already
	  set inside the functions.