gre/gre6: Post merge fixes

gre/gre6: Post merge fixes

Few minor changes after merge of 'master' into 'net-next' branch:

  1) Follow 80 line length for printing erspan_index parameter
     as we did in master with commit 2a8d0f6e9c3f ("gre/tunnel:
     Print erspan_index using print_uint()").

  2) Remove remnants of encapsulation option printing: now it
     is done using tnl_print_encap() helper in commit bad76e6b1f44
     ("ip/tunnel: Abstract tunnel encapsulation options printing").

Fixes: 8c75f69411bc ("Merge branch 'master' into net-next")
Signed-off-by: Serhey Popovych <serhe.popovych@gmail.com>