also trim spaces for boolean dynamic flags (fortio#442)

* also trim spaces for boolean dynamic flags. happens with configmap directories

* bump version to 1.11.5

* bumped build image to use latest go 1.15.6

fix fortio#436 (fortio#437)

fix fortio#430 and fortio#431 (fortio#432)

* fix fortio#431

* only check proxies count when in proxies command

* linter detected bug fix

* fix fortio#430

* bump to 1.11.3

bumping v1.11.2

update build image to go 1.15.5, prep for 1.11.1 release (fortio#429)

adding log.SetFlagDefaultsForClientTools() (fortio#423)

bumped build image to go1.15.3 and version

update version in readme

Make maximum delay a configurable dynamic flag (fortio#414)

Change at runtime to 6s (from 1.5s default):
http://localhost:8080/fortio/flags/set?name=max-echo-delay&value=6s

Fixes fortio#272

Adding fan out forwarder http proxy mode (-M ...) (fortio#410)

* Adding fan out forwarder http proxy mode (-M ...)

* linters and coverage increase

* bug fix on header transfers for tracing. increase converage/error cases

* default MaxIdleConnsPerHost is 2 (!) which killed perf for any kind of parallelization. set better default

Fixes fortio#160