handle multiline pm path packagename output

[mastrolube]

Hello!
Just found a problem handling the return of adb shell pm path packagename
I don't know why but it may return more packages and that will cause an error for uiautomator2 when starting the app without specific activities, because d.app_info(packagename) will ask atx-agent to find the package with the wrong name.

import uiautomator2 as u2
d = u2.connect()
d.app_info("com.instagram.android")

which returns the error:

BaseError: stat /data/app/com.instagram.android-bHoeaeqTH_3wNr4o9hp3tw==/base.apk
package:/data/app/com.instagram.android-bHoeaeqTH_3wNr4o9hp3tw==/split_pytorch.apk: no such file or directory

because in your code you're removing trailing spaces and \n, so you have a long string which is the mix of the two paths.

For your app, for example, it's only one row:
d.shell(["pm", "path", "com.github.uiautomator"])
ShellResponse(output='package:/data/app/com.github.uiautomator-QhCGbZTc-k5orXu8c81syw==/base.apk\n', exit_code=0)
And the code works correctly.

For Instagram you have something like that (in the last release):
ShellResponse(output='package:/data/app/com.instagram.android-bHoeaeqTH_3wNr4o9hp3tw==/base.apk\npackage:/data/app/com.instagram.android-bHoeaeqTH_3wNr4o9hp3tw==/split_pytorch.apk\n', exit_code=0)
which needs a little bit of string manipulation.
I've split the output where \n occurs and returned only the first row. That should work with one-row cases and multi-row cases.

[codeskyblue]

merge manually with gofmt
0c30c97