test: tweak test_fanotify to monitor ONLY 1 file (#2294) #29

Job	Run time
macos	1m 37s
minver	12s
rust_stable	1m 8s
linux_native_builds (x86_64-unknown-linux-gnu)	1m 18s
rustfmt	7s
linux_native_builds (x86_64-unknown-linux-musl)	1m 13s
tier3 (x86_64-unknown-dragonfly)	56s
tier3 (x86_64-unknown-openbsd)	57s
tier3 (x86_64-unknown-haiku)	53s
redox	41s
cross_compiling (aarch64-linux-android)	33s
cross (arm-unknown-linux-gnueabi)	1m 35s
cross_compiling (arm-linux-androideabi)	35s
cross (armv7-unknown-linux-gnueabihf)	1m 38s
cross_compiling (armv7-linux-androideabi)	32s
cross (i686-unknown-linux-gnu)	1m 32s
cross (i686-unknown-linux-musl)	1m 55s
cross_compiling (i686-linux-android)	34s
cross (mips-unknown-linux-gnu)	1m 50s
cross_compiling (x86_64-linux-android)	30s
cross (mips64-unknown-linux-gnuabi64)	1m 45s
cross_compiling (arm-unknown-linux-musleabi)	32s
cross (mips64el-unknown-linux-gnuabi64)	1m 37s
cross_compiling (x86_64-unknown-fuchsia)	24s
cross (mipsel-unknown-linux-gnu)	1m 38s
cross_compiling (x86_64-unknown-illumos)	27s
cross (powerpc64le-unknown-linux-gnu)	1m 35s
cross_compiling (aarch64-apple-ios, true)	26s
cross_compiling (powerpc64-unknown-linux-gnu)	35s
cross_compiling (s390x-unknown-linux-gnu)	33s
cross_compiling (x86_64-unknown-linux-gnux32)	33s
cross_compiling (x86_64-unknown-netbsd)	24s
	30m 45s

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