Cancel explicit deps in okio and okhttp

[d4vidi]

Description:

Fixes #1380 and similar problems in some projects that compile Detox, typically running RN-59, maybe 58.

This explains the fix in a nutshell:

• Using gradle's + wildcard for auto version resolution - which in facts yields the newest available version, works for react native as a dep, because RN gets resolved strictly from the synthetic node_modules/react-native/android "repo". The "newest" version is simply the one that's installed there.
• This isn't the case for okhttp and okio, which are found at the google and/or jcenter repos. In the current setting, that basically gives Detox the mandate to claim it relies on new, perhaps incompatible versions (e.g. okhttp 4), while really it can work with anything not too old.

Luckily, okhttp and okio eventually directly and indirectly come from the dep in react native itself (e.g. via fresco), so explicitly declaring them has been rendered useless now. Example from the Detox test app:

fromBinReleaseCompileClasspath - Resolved configuration for compilation for variant: fromBinRelease
+--- com.facebook.react:react-native:+ -> 0.56.0
|    +--- javax.inject:javax.inject:1
|    +--- com.android.support:appcompat-v7:26.1.0 -> 27.1.1
|    |    +--- com.android.support:support-annotations:27.1.1
|    |    +--- com.android.support:support-core-utils:27.1.1
|    |    |    +--- com.android.support:support-annotations:27.1.1
|    |    |    \--- com.android.support:support-compat:27.1.1
|    |    |         +--- com.android.support:support-annotations:27.1.1
|    |    |         \--- android.arch.lifecycle:runtime:1.1.0
|    |    |              +--- android.arch.lifecycle:common:1.1.0
|    |    |              \--- android.arch.core:common:1.1.0
...
|    +--- com.facebook.fresco:imagepipeline-okhttp3:1.9.0
|    |    +--- com.squareup.okhttp3:okhttp:3.10.0
|    |    |    \--- com.squareup.okio:okio:1.14.0
|    |    +--- com.facebook.fresco:fbcore:1.9.0
|    |    \--- com.facebook.fresco:imagepipeline:1.9.0 (*)
|    +--- com.facebook.soloader:soloader:0.3.0
|    +--- com.google.code.findbugs:jsr305:3.0.0
|    +--- com.squareup.okhttp3:okhttp:3.10.0 (*)
|    +--- com.squareup.okhttp3:okhttp-urlconnection:3.10.0
|    |    \--- com.squareup.okhttp3:okhttp:3.10.0 (*)
|    +--- com.squareup.okio:okio:1.14.0
|    \--- org.webkit:android-jsc:r174650