[IMP] Add Github authentication validations

Before this addition you would only have one chance to fill in the Github credentials.
If they where wrong the script would fail on a lot of the remaining steps, you would need to run the script and you might even get issues because of already used commands.
This commit adds the response from Github to check if the credentials are valid are not.
In case they're invalid we'll ask them again (untill they're correct) and we'll show a warning to the user that they where invalid or that the user does not have enough rights on the Github repository.
If they succeed we'll clone the enterprise repository and continue.

odoo_install.sh

@@ -62,10 +62,10 @@ sudo su - postgres -c "createuser -s $OE_USER" 2> /dev/null || true
 #--------------------------------------------------
 echo -e "\n---- Install tool packages ----"
 sudo apt-get install wget git python-pip gdebi-core -y
-	
+
 echo -e "\n---- Install python packages ----"
 sudo apt-get install python-dateutil python-feedparser python-ldap python-libxslt1 python-lxml python-mako python-openid python-psycopg2 python-pybabel python-pychart python-pydot python-pyparsing python-reportlab python-simplejson python-tz python-vatnumber python-vobject python-webdav python-werkzeug python-xlwt python-yaml python-zsi python-docutils python-psutil python-mock python-unittest2 python-jinja2 python-pypdf python-decorator python-requests python-passlib python-pil -y python-suds
-	
+
 echo -e "\n---- Install python libraries ----"
 sudo pip install gdata psycogreen ofxparse XlsxWriter xlrd
 
@@ -92,7 +92,7 @@ if [ $INSTALL_WKHTMLTOPDF = "True" ]; then
 else
   echo "Wkhtmltopdf isn't installed due to the choice of the user!"
 fi
-	
+
 echo -e "\n---- Create ODOO system user ----"
 sudo adduser --system --quiet --shell=/bin/bash --home=$OE_HOME --gecos 'ODOO' --group $OE_USER
 #The user should also be added to the sudo'ers group.
@@ -115,9 +115,18 @@ if [ $IS_ENTERPRISE = "True" ]; then
     sudo su $OE_USER -c "mkdir $OE_HOME/enterprise"
     sudo su $OE_USER -c "mkdir $OE_HOME/enterprise/addons"
 
-    echo -e "\n---- Adding Enterprise code under $OE_HOME/enterprise/addons ----"
-    sudo git clone --depth 1 --branch 10.0 https://www.github.com/odoo/enterprise "$OE_HOME/enterprise/addons"
+    GITHUB_RESPONSE=$(sudo git clone --depth 1 --branch 10.0 https://www.github.com/odoo/enterprise "$OE_HOME/enterprise/addons" 2>&1)
+    while [[ $GITHUB_RESPONSE == *"Authentication"* ]]; do
+        echo "------------------------WARNING------------------------------"
+        echo "Your authentication with Github has failed! Please try again."
+        printf "In order to clone and install the Odoo enterprise version you \nneed to be an offical Odoo partner and you need access to\nhttp://github.com/odoo/enterprise.\n"
+        echo "TIP: Press ctrl+c to stop this script."
+        echo "-------------------------------------------------------------"
+        echo " "
+        GITHUB_RESPONSE=$(sudo git clone --depth 1 --branch 10.0 https://www.github.com/odoo/enterprise "$OE_HOME/enterprise/addons" 2>&1)
+    done
 
+    echo -e "\n---- Added Enterprise code under $OE_HOME/enterprise/addons ----"
     echo -e "\n---- Installing Enterprise specific libraries ----"
     sudo apt-get install nodejs npm
     sudo npm install -g less