Added TCP Flags to Flow Record metrics (#68)

* Test commit

* Adding TCP flags

* Adding TCP flags to record metrics.TODO: Remove log stmts

* Updated tcp flags u32-> u16

* Updated indentation in C file

* Update flow.h

* Indent fixed. Tab -> 4 space

fixing indents

Indent fixes for flows.c

Indent fixes for flows.c-II

Still fixing indents

* Removed extra file

* Added clang-format config to bpf/. To use clang-format -i <file.c>

* Fixed message record member sequences

* Added TCP Flags combinations Read from flw

Updated changes according to comments on PR

* Removed log statements.

Rebase merges

* Fixing merge conflits

* Revert the renaming of grpc_test file

* Simplify setting flags for v4,v6

* Add flags to ipfix exporter

* Update protobuf

* Remove type conversions due to conflicts

* Remove .gitignore change

* Fix indentation

* Remove commented line

* Fixed typecast errors since move to go 1.18

* Reverting commit d1e9c44. Added changes as separate PR

* set flags for v6

Co-authored-by: Pravein Govindan Kannan <pravein.govindan.kannan@ibm.com>