Add Makefile target for running pep8 and pep8 configuration

Currently pep8 configured to ignore ALL errors that occures in Buildbot
code.

Makefile

@@ -15,3 +15,6 @@ pylint:
 
 pyflakes:
 	pyflakes master/buildbot slave/buildslave
+
+pep8:
+	pep8 --config=common/pep8rc .

common/pep8rc

@@ -0,0 +1,57 @@
+[pep8]
+show-source = yes
+statistics = yes
+count = yes
+#max-line-length = 80
+
+# List of currently ignored PEP8 issues.  Some of them definetely should be
+# enabled in future.
+#
+# E101 indentation contains mixed spaces and tabs
+# E111 indentation is not a multiple of four
+# E121 continuation line indentation is not a multiple of four
+# E122 continuation line missing indentation or outdented
+# E123 closing bracket does not match indentation of opening bracket's line
+# E124 closing bracket does not match visual indentation
+# E125 continuation line does not distinguish itself from next logical lin
+# E126 continuation line over-indented for hanging indent
+# E127 continuation line over-indented for visual indent
+# E128 continuation line under-indented for visual indent
+# E201 whitespace after '['
+# E202 whitespace before ']'
+# E203 whitespace before ':'
+# E211 whitespace before '('
+# E221 multiple spaces before operator
+# E222 multiple spaces after operator
+# E225 missing whitespace around operator
+# E226 missing whitespace around arithmetic operator
+# E227 missing whitespace around bitwise or shift operator
+# E228 missing whitespace around modulo operator
+# E231 missing whitespace after ','
+# E241 multiple spaces after ','
+# E251 unexpected spaces around keyword / parameter equals
+# E261 at least two spaces before inline comment
+# E262 inline comment should start with '# '
+# E271 multiple spaces after keyword
+# E272 multiple spaces before keyword
+# E301 expected 1 blank line, found 0
+# E302 expected 2 blank lines, found 1
+# E303 too many blank lines (2)
+# E401 multiple imports on one line
+# E501 line too long (80 > 79 characters)
+# E502 the backslash is redundant between brackets
+# E701 multiple statements on one line (colon)
+# E703 statement ends with a semicolon
+# E711 comparison to None should be 'if cond is None:'
+# E712 comparison to False should be 'if cond is False:' or 'if not cond:'
+# E721 do not compare types, use 'isinstance()'
+# W191 indentation contains tabs
+# W291 trailing whitespace
+# W292 no newline at end of file
+# W293 blank line contains whitespace
+# W391 blank line at end of file
+# W601 .has_key() is deprecated, use 'in'
+# W602 deprecated form of raising exception
+# W604 backticks are deprecated, use 'repr()'
+
+ignore = E101,E111,E121,E122,E123,E124,E125,E126,E127,E128,E201,E202,E203,E211,E221,E222,E225,E226,E227,E228,E231,E241,E251,E261,E262,E271,E272,E301,E302,E303,E401,E501,E502,E701,E703,E711,E712,E721,W191,W291,W292,W293,W391,W601,W602,W604