rfc.sh: fix the missing rebase issue

When we decided to use clang-format for coding-style, and not bother
about local `check-patch.pl`, we had commented out coding style check
method in `./rfc.sh`.  While it was intended and valid, we missed to
see one major issue with that. `git fetch` command, which fetched
latest code of the project, was inside the check_patches method, which
also got missed.

Even though we had an explicit 'rebase_orgin' method, it did nothing
because the git fetch was not done before this. Now, calling an explicit
git fetch, and removing dead code of check patches, as we are all fine
with coding-style changes in last 4+ months.

updates: bz#1193929
Change-Id: I3779096a527b93e780858ada8d988fdcdd6e2928
Signed-off-by: Amar Tumballi <amarts@redhat.com>

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