Fixed support python 2 on Fedora 27

I7d16194d6ba1391ca31251d5b50cbb8de033fc38 added wrong behavour
on Fedora > 26 and Centos 7 when python3 disabled
pip should install packages in /usr/bin

Closes-Bug: #1820070
Change-Id: I3a8efbc8eb6e311db9c7347577c5d2047ba523a9

Author: Lenny Verkhovsky

inc/python

@@ -49,16 +49,9 @@ function get_python_exec_prefix {
     fi
     $xtrace
 
-    if python3_enabled && [[ "$os_VENDOR" == "CentOS" ]] || \
-    [[ "$os_VENDOR" == "Fedora" && $os_RELEASE -gt 26 ]]; then
-        # Default Python 3 install prefix changed to /usr/local in Fedora 27:
-        # https://fedoraproject.org/wiki/Changes/Making_sudo_pip_safe
-        echo "/usr/local/bin"
-    elif is_fedora || is_suse; then
-        echo "/usr/bin"
-    else
-        echo "/usr/local/bin"
-    fi
+    local PYTHON_PATH=/usr/local/bin
+    ( is_fedora && ! python3_enabled ) || is_suse && PYTHON_PATH=/usr/bin
+    echo $PYTHON_PATH
 }
 
 # Wrapper for ``pip install`` that only installs versions of libraries