Fixing flash issue for tti and 2600 model

[jharajeev55]

Enabling non-blocking true before to firmware upgrade to fix the flash issue for tti and 2600 over slow speed connection.

giving sleep to for sometime to assume that most probably firmware file has been transferred successfully

[github-actions]

Package	Line Rate	Health
kic-visa/src/process.rs	0%	❌
kic-lib/src/interface/connection_addr.rs	57%	✔
kic-lib/src/instrument/mod.rs	0%	❌
kic-lib/src/instrument/authenticate.rs	17%	❌
instrument-repl/src/state_machine.rs	61%	✔
kic-discover/src/ethernet/mod.rs	0%	❌
kic-lib/src/instrument/language.rs	25%	❌
kic-visa/src/main.rs	0%	❌
kic-lib/src/model/ki2600.rs	93%	✔
kic-lib/src/protocol/raw.rs	67%	✔
kic-lib/src/model/versatest.rs	78%	✔
kic-lib/src/instrument/script.rs	100%	✔
kic-discover-visa/src/lib.rs	0%	❌
instrument-repl/src/resources/mod.rs	100%	✔
instrument-repl/src/repl.rs	0%	❌
kic-lib/src/protocol/mod.rs	34%	➖
kic-lib/src/protocol/visa.rs	0%	❌
kic/src/main.rs	0%	❌
kic-discover-visa/src/instrument_discovery/mod.rs	0%	❌
instrument-repl/src/instrument.rs	85%	✔
kic-discover/src/main.rs	0%	❌
kic-discover-visa/src/ethernet/mod.rs	0%	❌
kic-lib/src/protocol/stb.rs	31%	➖
kic-lib/src/instrument/abort.rs	0%	❌
kic-lib/src/interface/mod.rs	0%	❌
kic/src/process.rs	0%	❌
kic-lib/src/instrument/reset.rs	0%	❌
kic-discover-visa/src/visa.rs	0%	❌
kic-lib/src/instrument/login.rs	0%	❌
kic-discover/src/process.rs	0%	❌
kic-discover-visa/src/main.rs	0%	❌
kic-lib/src/model/ki3700.rs	93%	✔
kic-lib/src/model/tti.rs	92%	✔
instrument-repl/src/tsp_error.rs	0%	❌
kic-discover/src/lib.rs	0%	❌
kic-lib/src/model/mod.rs	20%	❌
kic-lib/src/interface/async_stream.rs	0%	❌
kic-discover/src/instrument_discovery/mod.rs	0%	❌
kic-lib/src/instrument/info.rs	55%	✔
Summary	45% (3630 / 8118)	➖