Use extended logging for PDP contexts

Log additional details (IMSI, NSAPI etc) on PDP context
creation/deletion by using appropriate LOGP() wrappers.

Change-Id: I91a126952ae75ae9ba1f42aac4d26413384bba5d
Related: SYS#3610
diff --git a/configure.ac b/configure.ac
index cd60f07..c8e23e5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -62,7 +62,7 @@
 
 
 found_libgtp=yes
-PKG_CHECK_MODULES(LIBGTP, libgtp >= 0.92, , found_libgtp=no)
+PKG_CHECK_MODULES(LIBGTP, libgtp >= 1.0.0, , found_libgtp=no)
 AM_CONDITIONAL(HAVE_LIBGTP, test "$found_libgtp" = yes)
 AC_SUBST(found_libgtp)